Your baby can now blink!
Baby will now be regularly making his presence felt, you will feel him rumbling around in there, the very earliest ‘kicks’ can be mistaken for tummy rumbling, however.. get used to it, he is going to get a lot more active over the next weeks.
Your hair and nails are growing at record speed? Extra hormones and increased blood supply cause extra nutrients to these, and you will begin to ‘glow’.

Your baby is now the size of an...
Endive.
Baby is now around 8 inches long and weighs around 12 oz. He is now swallowing tiny amounts of amniotic fluid every day, and his taste buds are starting to develop, he will be beginning to get a taste of what you are eating!
Your baby's eyebrows and eyelids are fully developed, and he can now blink. Your baby is starting to move around and will be developing a pattern of waking and sleeping.
Pregnancy symptoms at 21 weeks
Leaky boobs, leg cramps, heartburn and Braxton Hicks contractions - which is basically your uterus tightening as it practices for labour. These contractions go away on their own when you switch positions.
Tips and advice for pregnancy at 21 weeks
At this stage, some women experience weird or unhealthy cravings for cigarettes, charcoal, ashes, or beer. These are all prohibited while you are pregnant, so talk with your doctor about these new cravings.