Because they spent many months growing inside a protected environment being supplied with all the nutrients they needed to grow and only urinated in the womb. Once they are born, sounds are louder, they defecate and urinate in a diaper that can burn their sensitive skin if left for too long, they are getting used to the feeling of being hungry, and the lull of hearing their Mother's heartbeat which was likely quite soothing is gone as well.
Their gums hurt as they teethe, so yes they get very fussy.
no
Newborn babies put their mouths against the nipple on their mother's breasts. Then they suck the milk that flows.
Newborn Bush Babies are called bushels in most countries except for Africa, where they are called Gala.
No, the tear ducts in newborn babies are not fully developed, so they cannot cry real tears.
Leave the babies alone. Hamsters are known for cannibalizing their babies if they are handled before they are starting to wean.
Newborn babies look blue because in the first seconds after they were born they had not got sufficient amount of oxygen.
Yes.
Newborn babies
Neonatology
Newborn babies don't pass gas because they don't yet have gas-producing bacteria in their intestines.
Newborn babies can't communicate by talking so they communicate by crying. If a newborn baby is crying they are likely telling you that they are either: hungry, tired, gassy, cold or hot.