Clothing shrunk

Rana • Married a year and a half, pregnant with first child.
So I washed all my newborn and 0-3 month clothes on delicate(cold water) and dried on low heat( also delicate). All the newborn now looks preemie and the 3 month looks newborn. They were all new from Carters mostly. Has anyone else had this happen? Seems like I'll get no use out of the newborn clothes at all, and barely will use the 3 month.