Fetal development in pregnancy week 22: fetus in fifth month The grow must go on! No wonder you’re getting so big, you’re now housing a wonder-baby who weighs nearly a pound and measures nearly a foot in length. Their perfect little pancreas is now further developed and they’ve also started producing their own hormones! Your baby's future in the circus as a world-famous tight-rope-walker is secure: their inner ear is now developed to the point that they have their own sense of balance. Lucky for your little explorer, balance also promotes physical dexterity, which has them actively feeling out their surroundings where skin, body parts, and the resident umbilical cord are the big sensory experiences. Your foot-long baby, is looking a bit like an oversized raisin right now as more and more wrinkles are showing up each week. Not to worry, all that excessive wrinkling is just their skin’s way of planning ahead for the time when they’ll start piling on that irresistible baby chub.