3 Preemie XS Pampers Diapers for babies Reborn and Ooak Baby Dolls Ooak Baby Extra Small Doll Diapers Reborn Extra Small Doll Diapers Preemie Extra Small Diapers Pampers Name Brand These are very small and fit small baby dolls. This size diaper will fit up to a 4 lb. real life baby. Dolls come in different sizes, so please be sure that this size will fit your doll before purchasing.