The questions comes from a Duolingo discussion.
The sentence in that discussion is "¿Cuántos meses tiene tu bebé?" and the accepted answer is "How many months old is your baby?" or "How old is your baby?".
My initial translation of the sentence is "How many months do you have your baby?", and thought 'tiene' is describing the person I'm asking question to; then I realized that 'tiene' (3rd person polite *) doesn't match 'tu', and understand my answer is not correct.
However, if the sentence is "¿Cuántos meses tienes tu bebé?" or "¿Cuántos meses tiene su bebé?", can we translate it to "How many months do you have your baby?".
Update: * I meant '2nd person polite'.