What you are feeling is perfectly normal and after having three kids myself I can tell you that many many many many women feel the same way you are feeling now after giving birth... give it some time, do a little walking with the baby in a stroller and start some mild toning exercise to help you to feel better about you - and in no time that old romantic feeling will return if you allow it to.

P.S.
Most of these feelings are the females mind
and not even being thought of by the male