Now that you are in your fourth month of pregnancy, your baby has defined fingers and toes, hair, eyebrows, eyelashes, bones, teeth, and nails. Your baby has even started to make motions like making faces, yawning and sucking its thumb. The earliest you may be able to tell your baby’s sex is in week 14, though many don’t find out until week 17 or later. In week 15, your baby’s bones become denser and are visible through the ultrasound. Week 16 is the early stage of your baby learning to suck his or her thumb and in week 17, fat starts accumulating. Your baby can hear near the end of month four. Your baby is about six inches long by the time it reaches the end of the fourth month.
Depending on what calculations you go by, month 5 starts at week 18 or week 19. Your baby’s hair is growing more rapidly and since he or she is starting to move, you feel movements clearly during this time. If you are having a girl, her uterus typically forms in week 19. Week 20 marks your pregnancy’s halfway point, which is when quickening (baby movements) begins. If this isn’t your first pregnancy, you may have already felt some flutters. In week 21 and week 22, your baby learns to swallow and is generally more active.
In month 6, your baby starts to hiccup, has visible veins and their eyes begin opening. Around week 24, your baby is waking up and sleeping in regular intervals. By week 25, your bundle of joy can not only hear your voice but respond to it. Fingernails are developed in week 26, and in week 27, your baby’s nervous system and lungs are beginning to mature. Your baby is now about 12 inches long (double the length at month four) at the end of month six. He or she weighs about 2 pounds to 2.5 pounds at the end of your second trimester.
Now that you see how much development your baby is going through, you understand why months four-six require so many bodily changes.
Second-trimester tools, calculators, and quizzes
Is it a Boy or a Girl? Predict the Baby's Sex
Baby Eye Color Predictor
Weight Change Calculator
BMI Body Mass Calculator
How Safe Are These Beauty Routines During Pregnancy?
Which Activities Are Safe During Pregnancy?
What is a Healthy Fertility and Pregnancy Diet?
Second trimester by the week
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What you need to know about your second trimester
Second Trimester Checklist
How to Survive the Second Trimester of Pregnancy in 12 Steps
What Happens in the Second Trimester of Pregnancy with my Body?
What Happens in the Second Trimester of Pregnancy with my Baby?
What Happens in the Second Trimester of Pregnancy with my Doctor's Appointments and Tests?
What Happens in the Second Trimester of Pregnancy with my Relationship?
The Second Trimester from the Male's Perspective
Second Trimester Miscarriage