darling,
honey (US, informal), sugar (informal), babe (slang), sweetheart, lover, love
(UK, informal)
infant,
child, newborn, babe in arms, tot (informal), little one, kid (informal), babe
(literary or archaic)
pamper,
coddle, mollycoddle, cosset, overprotect, spoil, indulge, make much of, fuss
over