Vision is the least developed sense at birth as the womb is a fairly dark place and there is little opportunity for development. Vision, like hearing, does develop rapidly over the early years of a baby's life. Babies are essentially born legally blind but do have some visual preferences even at birth.
A baby cannot taste salt until it is 4 months old.
Baby kneecaps don't show up in x-rays, but your baby does have kneecaps.
A baby could hear your voice and other sounds from about 23 weeks of pregnancy.
From birth to toilet training, a baby goes through an average of 7000 diaper changes.