Journey through the First Trimester of Mother and Baby

Pregnancy is a truly remarkable and awe-inspiring journey. From the initial stages in the first trimester to the eagerly awaited labor, every week brings new changes and milestones. Witness the incredible growth and development of your precious baby as you embark on this extraordinary adventure of motherhood. Get ready for an exhilarating rollercoaster ride filled with unforgettable experiences and cherished moments.


First trimester – 1 to 12 weeks

Weeks 1- 4

During the initial stage, if you’re probably not currently pregnant, it is likely that you may not experience pregnancy symptoms. However, medical professionals typically calculate the duration of your pregnancy starting from the last day of your menstrual period. This is considered the beginning of your conception week.

Size of the embryo: mustard seed


Changes in You

As the weeks progress, you may start noticing common signs of pregnancy, such as breast tenderness, and sore breasts. This is also an appropriate time to consider taking a pregnancy test to confirm your suspicions.


Week 5

Welcome to the second month of your pregnancy! At this stage, your tiny embryo is about the size of a small orange seed and resembles a tadpole with a head and tail. Excitingly, this is the week when the development of crucial bodily systems kicks into high gear. The digestive system, nervous system, heart, lungs, and other vital organs begin to form.


Changes in You

As for the mother’s body, you may start noticing changes due to an increase in hormones. Some common symptoms include sore breasts, breast enlargement, and darkening of the nipple area. You might also experience fatigue, frequent urination, and even the onset of morning sickness, although these symptoms may not be too intense for most women.

It’s important to stay well-hydrated during this time. Aim to drink six to eight 8-ounce glasses of water daily to support your overall health and the development of your baby.


Week 6

You’re now halfway through the second month of your pregnancy, and your little embryo has grown to the size of a pea, measuring around 1/4th of an inch. Excitingly, your baby’s backbone is developing, extending to a small tail.

During this stage, facial features are starting to form. The cheeks, chin, and jawline are taking shape, along with the inside of the mouth, tongue, vocal cords, and ear canals. And two small dots indicating the early formation of your baby’s eyes.

As your baby continues to grow, arms and leg buds are also developing. However, one of the most fascinating milestones is the start of your baby’s heartbeat.

If you have an ultrasound (most of you have to confirm the pregnancy), you may have the incredible opportunity to witness this momentous event.


Changes in You

While some women may not experience noticeable symptoms at this stage, others may start to experience certain pregnancy symptoms. Morning sickness, in particular, maybe more intense than in the previous week. Remember, it’s a temporary phase, and it tends to subside by the end of the first trimester.To support your overall health and pregnancy, make sure to include fibrous foods in your diet. These can provide essential nutrients and help maintain a healthy digestive system.



At this stage of your pregnancy, your baby is approximately a quarter of an inch in size, similar to that of a blueberry.

It’s fascinating to note that your baby’s hands and legs may resemble webbed feet, reminiscent of ducks. Meanwhile, the brain is undergoing rapid development, setting the stage for future growth.


Changes in You

As for your own experiences, this week may bring about some notable changes. You might begin to experience mood swings, pregnancy cravings, and aversions to certain foods. Constant urination and further enlargement of the breasts are also common symptoms during this time.

It is essential to stay aware and take precautions regarding the Zika virus. Be informed about the areas where Zika is prevalent, and if you live in or plan to travel to such areas, take necessary measures to prevent exposure to mosquito bites.

Take care of yourself and follow any medical advice or guidelines provided by healthcare professionals. Have a balanced diet and stay healthy.


Week 8

Congratulations on completing the second month of your pregnancy! By the end of the eighth week, your baby has made remarkable progress, with all vital organs beginning to develop. At this stage, your baby is about the size of a raspberry and has a nose, eyelids, and lips taking shape. Additionally, the heart is beating at a rapid pace, twice as fast as the previous week.

Excitingly, you’re going to have your first ultrasound soon, where you’ll be able to see and hear your baby’s heartbeat. It’s a truly memorable experience that allows you to connect with your little one.


Changes in You

As your pregnancy progresses, you can expect more changes in your body. One notable change is an increase in vaginal discharge, known as leukorrhea. This is a normal occurrence, but it’s advisable to wear cotton underwear and change it whenever necessary for better hygiene. If you notice thick yellow or green discharge with an unpleasant odor, or if you experience a white lumpy discharge, it’s recommended to consult your ob-gyn.

Hormonal changes can also lead to constipation, so you may feel that your bowel movements are less frequent.

Staying hydrated, eating a fiber-rich diet, and engaging in light exercise can help alleviate this discomfort.

Morning sickness may also continue during this time, but remember that it varies from person to person. If you’re experiencing severe nausea and vomiting that impair your ability to eat or stay hydrated, it’s important to seek medical advice.

Week 9

You are at the start of 3rd month of your pregnancy. Baby starts to look even more like a human and their eyelids are completely formed. Facial features are more developed. Ears and muscles are in the beginning stage of development. The spinal code tail has disappeared. Baby’s head starts to straighten up. The baby is about an inch now, like the size of a cherry.


Changes in You

Your uterus is now the size of a grapefruit. And you can see a visible change in your body (your clothes are feeling a little bit tight).

There will be an HCG hormone increase so you will feel to urinate more often (but drink more and more water).

If this is your first pregnancy because of the body changes you will feel these changes drag you to an emotional rollercoaster.

The high feeling of tiredness, fatigue, and nausea is very common in the 1st trimester. Better you take a nap and rest whenever you feel to.


Week 10

Your Baby is one and a half inches, and the size of a date. Your embryo has grown into a fetus.

The tooth is starting to form inside the gums, cartilage, and bones are in the stage of development.

The tiny kidneys are fully developed and starting to function. Stomach acids are starting to be produced by the stomach. They have functioning eyelids but the feet and fingers are in the form of webbed.

Changes in You

You are in the middle stage of 3rd month. The feeling of exhaustion and sleep makes you lie in bed all day long. Due to less bowel movement, you will start to feel heartburn, sore throat, a bad taste on the tongue, and nose irritation.

You should need to take a balanced diet with fiber, proteins, and folic acids.


Week 11

You are now 2 months and 3 weeks. The baby has grown to a length of 2 inches and has a size of a pacifier. Internal organs are fully developed and in the stage of maturing. Your baby’s head is half the length of the body, and fingers, and toes are separated and are growing. The genitals area is forming and can be differentiated but can’t identify the gender in the ultrasound (not visible).

This is the week or month we check the baby’s health.

Changes in You

You will start to feel food cravings and love weird tastes. According to your body type, some pregnant women have a visible baby belly/ baby bump. There will be morning sickness but the level of intensity is less compares to the previous weeks.

You will start to feel even more tired and sleepy. The bowel movement is less and slow, because of the loosening of the digestive system there is a high chance you feel gassy and bloated. Still, the breast is tender.


Week 12

Congrats, this is the last week of your 1st trimester. Your baby is 2 and a half inches long. Almost the size of a plum. Baby starts to move but it is not that much intense, so you can’t feel it. Bones are still in the progressing stage of development. Your baby starts to generate urine.

You may or may not have an ultrasound this week. Depends on the previous ultrasound you took to confirm the pregnancy and know the baby’s growth.

Changes in You

In some cases, morning sickness will put a full stop. But in most of the cases, morning sickness starts to improve. You will feel exhausted. And you will start to adapt to the body changes.

To the end of the 1st trimester, you should consider doing any physical activity or engaging in other duties to feel more active and energized, so staying in bed all day long won’t be an option. ( if you are not recommended to take rest)
The baby bump is never a sign of a healthy baby, the size of the baby bump can vary for all pregnant women.
From finding the pregnancy to the healing from labor your ob-gyn is the one person who knows everything about your health, so he/ she is the only person who can provide you best answers to your doubts and concerns.
The above-mentioned details can vary from person to person. This is just an idea of what you can expect in your 1st trimester.

In Millennium Hospital which mainly focused on women and child care, our team of professional doctors and midwives who can help you and provide you best possible care. You can get in touch with us by clicking contact


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