PureBaby Zip Growsuits
"In the newborn days, you’ll change these once every few hours.
Zips vs. press studs (or - yikes - buttons!) saves precious time you could spend eating biscuits. Other mums suggest doing away with the onesies altogether as pants/tops are easier to change, but I guess it depends what season your Bub is born in.
The PureBaby ones withstand the constant washing, and come in sweet, non-gross patterns and colours. Get a few of each and see what suits you."