Clothing confusion

Ok i know ill sound silly sorry for that but its first time

Mom to be here and i am so confused in terms of buying clothes for my baby like how many newborn sizes should i buy and how many 0-3

What size and fit exactly should i carry to the hospital? A nurse told me to carry a pajama set for first day as babies have bellybutton and it hurts them in sleep-suits. I really don’t know what’s an ideal purchase so far i just got whatever caught my eye interms of cuteness