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Second Trimester

16 Weeks Pregnant

Your baby is the size of a Avocado 🥑

🥑
Ashok Kumar Poudel
Written by
Ashok Kumar Poudel
Health & Wellness Writer
Dr. Bina Basnet
Medically reviewed by
MBBS, MD — Gynecologist & Obstetrician
Last reviewed:
Feb 2026
📏
Size
Avocado
📐
Length
11.6 cm
⚖️
Weight
100 g
🗓️
Trimester
Second
⏱️
Week
16 of 40

🌱 Baby Development at Week 16

Eyes are now sensitive to light. Ears are almost in final position. Baby's heart pumps 25 liters of blood per day. Some moms begin feeling movement — called 'quickening' — around this time.

First movements (quickening) possibleEyes sensitive to lightHeart pumping actively

🤱 Common Symptoms

Quickening (first baby movements) may be felt
Belly bump clearly visible
Constipation
Occasional nosebleeds
Back pain

🥗 Nutrition Tips

  • Increase protein for fetal muscle development
  • Eat foods high in vitamin A (carrots, sweet potato)
  • Avoid excessive Vitamin A supplements (toxic in high doses)

🏃‍♀️ Exercise Tips

  • Hip circles and pelvic tilts for back pain
  • Water aerobics ideal
  • Avoid lying on back for extended periods

🏥 Medical Tests & Appointments

Quad screen (AFP, hCG, estriol, inhibin A): 15-20 weeksAnatomy scan scheduling

🔬 Hormone Changes

Estrogen surges — increasing blood supply to skin, giving that 'glow'. Aldosterone rises to manage increased blood volume.

📖 Week 16 Pregnancy — In-Depth Guide

Buckle up because things are going to get pretty exciting in week 16 of pregnancy. This is probably the week when you will have your next prenatal visit, at which you will most likely get to hear your baby’s heartbeat again. What’s even more thrilling is that you will probably get to feel your baby kicking when you’re 16 weeks pregnant. Your baby at this stage of your pregnancy can probably hear your voice, so feel free to read bedtime stories or simply chat up a storm. In terms of size, your baby when you’re 16 weeks pregnant is as big as an avocado or donut, which is slightly bigger than its size in your 15th week of pregnancy.

🩺16th Week Pregnancy Symptoms

Surprisingly, some of the symptoms of week 16 of pregnancy are actually good such as your accelerated hair and nail growth, where your hair may be more nourished and thicker and your skin may be more radiant. Here are some of the other common symptoms you may experience in week 16 of pregnancy.

Bigger boobs

Bigger breast during pregnancy

Your boobs have probably become a few cup sizes bigger, and this is because they are preparing for breastfeeding when your baby arrives.

Backaches

This week 16 pregnancy symptom can be attributed to bigger boobs and also a side effect of pregnancy hormones . Pregnancy exercises are an excellent remedy for backaches such as regularly stretching your body or simply sitting and standing up.

Forgetfulness

Also referred to #PregnancyBrain, the actual reason for forgetfulness in pregnant women is unknown, where some medical experts believe that it could be biological, and others attribute it to having a lot of things on your mind.

Constipation

This is often a result of your expanding uterus, which is now pressing on your intestines. To ease constipation, opt for more fiber rich foods and drink plenty of water.

Glowing skin
Glowing skin during pregnancy
This is the glow that everyone told you about, and now you can experience it firsthand.
Sensitive eyes
Sensitive eyes during pregnancy
Itchy eyes are mostly caused due to a surge in hormones, and over the counter eye drops should provide great relief.

If you’re pregnant with twins, your symptoms in most cases will be the same as a mother having one baby. It is highly recommended that you keep your doctor in the loop about all your symptoms owing to the fact that twin pregnancies are considered riskier than others.

🤰Inside your Belly in Week 16

You may feel your baby moving around starting week 16. These movements may initially feel like gas or muscle twitch, but they will undeniably be your baby’s movements as it gets bigger and stronger. Even if you’re pregnant with twins, you will feel these moving sensations at the same time as a mom pregnant with one child. It goes without saying that they will be much stronger, and you may experience other issues along with it such as your lungs crowded by your babies.

baby kicking quote

📷16th Week Pregnant Ultrasound - What to Expect ?

You will probably be due for your second prenatal visit when you’re 16 weeks pregnant. Most tests that will be performed at this prenatal will almost be the same as your first prenatal visit, only this time your doctor will be checking your urine for signs of preeclampsia and gestational diabetes. You may even have an ultrasound at 16 weeks pregnant, and good news is that once your OB checks the results, the chances of having a miscarriage are slim to none and in terms of numbers that’s less than 2 percent.

ultrasound image on week 16

👶Your Baby's Development in Week 16

Your baby body in week 16 of pregnancy is doing a whole lot to support itself. Their kidneys are in gear and are producing urine, which is then passed through the umbilical cord. Adding to this, bile is secreted within their stomach, but they are still highly dependent on you as a source of nutrients. Considering that your baby’s scalp is growing, its appearance will change accordingly and it may even have color. Your baby can most likely open and close its mouth owing to its developing facial muscles, and may even smile at you albeit without you knowing it.

baby growth inside belly during week16

Your baby in week 16 of your pregnancy tips the scales at approximately 3.53 ounces and measures 4.57 inches, so it’s definitely getting there rather quickly. Since its limbs and joints are fully formed, your baby is probably engaging them in good stretches and flexes, and it may also have found its thumb and learnt how to suck on it. In most cases you baby will begin to straighten out their head and neck more when you’re 16 weeks pregnant owing to its stronger backbone. In terms of its nervous system, it is starting to make connections with all their muscles, so now it will be moving with a little more purpose.

Starting week 16, your baby’s facial expressions are starting to take flight, meaning they begin to appear even though they have little or no control over them. Did you know that your 4 month old fetus will shy away when a bright light is shone on your belly? This is because your baby’s eyes are now becoming sensitive to light. Speaking of eyelids, they are still fused shut, but your baby is able to move their eyes around when your 16 weeks pregnant.

Pregnancy Week 16 Checklist

Maintain a baby diary to track each milestone of your pregnancy
Schedule your week 20 prenatal visit
Start making a list of baby names
📅 Track Your Pregnancy:Due Date CalculatorSymptoms by WeekTrimester Guide← Week 15Week 17

Frequently Asked Questions

Common questions answered by our medical team

At 16 weeks, your baby is approximately the size of a Avocado (🥑). Eyes are now sensitive to light. Ears are almost in final position. Baby's heart pumps 25 liters of blood per day. Some moms begin feeling movement — called 'quickening' — around this time.

← Week 15Calculate Your Due DateWeek 17

🔗 Related Second Trimester Resources

First Trimester
Weeks 1–13 guide
Third Trimester
Weeks 28–40 guide
Trimesters Explained
Guide to all three trimesters
Symptoms Week by Week
What to expect each week

All Pregnancy Weeks

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