Collocations for infant - noun

young
He is studying hearing in very young infants.

month-old, two-month-old, etc.
newborn
premature, preterm
jaundice in premature infants

full-term
healthy, normal
low-birthweight
human
a book on intellectual development in the human infant

female, male
sleeping
Marjorie looked down at the sleeping infant in her arms.

breastfeed, feed, nurse

death, mortality
countries with high infant mortality

child, daughter, son
formula

sudden infant death syndrome