Answer:

triplets

Answer	Crossword Clue
TRIPLETS	Three that arrive together
TRIPLETS	Rare sights in nurseries
TRIPLETS	Special delivery?

TRIPLETS	Surprise for an expectant father.
TRIPLETS	Three of a kind.
TRIPLETS	Family members.
TRIPLETS	Household addition.
TRIPLETS	Donald Duck's nephews
TRIPLETS	Maternity surprise
TRIPLETS	Parent's armful
TRIPLETS	Delivery room surprise?

TRIPLETS	Uncommon delivery
TRIPLETS	Three of a kind
TRIPLETS	Maternity threesome
TRIPLETS	Unusual delivery
TRIPLETS	Rare birth