In week 15, the baby is the size of an apple and their brain now controls all their muscles allowing them to move and somersault, though a first time mother likely won't feel the movement for several more weeks. In week 16, the baby is the size of an avocado and can make a fist and suck their thumb. In week 17, the baby is the size of a pear and while they have hiccupped before, this is the first time the mother may feel the baby's hiccups.

1. Week 15
Your baby is now the size of an apple. His brain now controls all the muscles in her
body; he is able to move. Yes, he'll even do somersaults! But if this is your first baby,
you probably won't feel him moving for several more weeks.
Baby's Length: 3.98 in.
Baby's Weight: 2.47

2. Week 16
Your baby is now the size of an avocado—and she can make a fist and even suck her thumb.
Baby's Length: 4.57 in.
Baby's Weight: 3.53 oz.

3. Week 17
Your baby is now the size of a pear.
He has hiccupped before, but this is the first time you might feel it.
Baby's Length: 5.12 in.
Baby's Weight: 4.94 oz.