Are you supposed to pull back foreskin on baby?

At birth, the foreskin of most male babies doesn't yet pull back (retract) fully. Treat the foreskin gently, being careful not to force it back. Forcing it could cause pain, tearing and bleeding.

Does foreskin retract automatically?

The foreskin is a double-layered skin fold that in most cases partially covers the head of the penis (the glans). As a male grows up, the foreskin usually loosens and detaches from any attachment sites to the glans. ... During erection, the foreskin retracts by itself, exposing the entire glans or at least part of it.