A baby’s heart beats at 18-21 days.
At 6 weeks the heartbeat is steady at around 110 beats per minute.
At 8 weeks all organs are in place.
At 9-12 weeks a baby can squint, swallow, hiccup, and suck his/her thumb.
By the 12th week a baby has fingerprints, kicks, is sensitive to heat, touch, noise, and all body systems are working.
A baby at 12 weeks is 2 ½ -3 inches long and can sit in the palm of your hand.