When can I start exercises to strengthen my core muscles post pregnancy?

It depends on individual physical fitness. If you are a mommy who exercises regularly before giving birth and you have an uncomplicated vaginal delivery, you may start exercising immediately after giving birth by doing simple stretching and muscle strengthening exercises. If you have a C-section, it will be better to start exercising after your have recovered. I personally started exercising my belly area by practising simple deep breathing and muscle contraction exercise while lying on bed. It is very simple. While lying on bed, take in deep breathe and tuck in your tummy. You should feel the tightening of muscle around your belly. Repeat this several times whenever you have time. This can help to strengthen your abdominal muscles.