No wife, no pregnancy, but the son is already named [duplicate]

No wife, not her pregnancy but the son's name is soma lingam (some ×)

Aalu ledu, chulu ledu kani koduku peru matram somalingam. (Telugu)

Some people think of the future happening without any base in the present. This idiom is used to talk about such people in a humorous context.

_It is not equal to building castles in the air because it is not an impossible task for him to marry and beget a son. He is imagining things too early.

The idiom is used to talk about a person who talks about something well in advance without any scope for such a talk. A married man
may talk about his/ her son' s being christened but it is a foolish to talk about the name of a son well before his marriage without having a wife.

Is there such a phrase or an idiom in English?

Solution 1:

You could call this getting ahead of yourself.

You have named your son soma lingam, but you are not married or pregnant. Aren't you getting ahead of yourself?

Solution 2:

This is putting the cart before the horse:

to do things in the wrong order:

• Aren't you putting the cart before the horse by deciding what to wear for the wedding before you've even been invited to it?