This is fabulous. As a rule, babies need to be held and cuddled. This actually affects their brain development.
Sometimes parents can't be there 24/7 - they might be single parents, they might have to work, they might live a long way from the hospital and have other children, etc.
Sometimes, too, you may have babies that have been or are going to be placed for adoption or are going to be put into care. Sometimes they may not have found an adoptive family or foster carer for the children yet. A caring adult can be supporting the babies' developmental needs and filling that role while plans are being set up.
The only exception would be that there are some babies who are so preterm and/or so fragile they aren't able to tolerate much touching or handling. Usually, though, when they become stronger, they can and should be held. "Kangaroo care", where the baby is cuddled against the parent's bare chest, has been shown to help stabilize temperature and other vital signs and is especially helpful for preemies.