Boys and dolls

I feel it is okay for boy to play dolls. My son who is 2 years old now also likes to hold his sister's baby doll. Playing doll can initiate pretend play and enhance imagination, e.g. on how to take care of a baby and how to love a baby. Sometimes, we use doll to play doctor and patient pretend play too. However, I will refrain my boy from playing with barbies as it is too girly for a boy. But, I do notice boys and girls do have preferences on types of toys, i.e. boys are more interested in vehicles while girls are more interested in dolls.