He wants a baby

My Boyfriend is very established and we have a healthy relationship. We both have sons from different relationships that are only one month a part— 4 year olds. He asked me yesterday if I wanted a baby with him. I found it hard to take him serious I just kept nervously laughing. He said he was serious and that he really wants a baby with me.

He said he is a provider and an alpha and wants to have a family and to provide for that family.

Is this normal?