18 weeks ( could be 20 )

How your baby's growing

This week, you officially begin your fifth month of pregnancy. Your baby may have reached 15 cm from crown to rump by now, and he can both feel and hear. Admittedly at the moment, all he can hear is your heartbeat and the flow of your digestive system but soon he'll be able to detect noise outside the womb and identify your voice.

Thumb-sucking at 18 weeks....