Firstly, CONGRATULATIONS on your beautiful baby and on already dropping 16kgs!!!

Cardio cardio cardio!! I know, I wish there was a nicer answer but there isn't really. All the stuff that you're doing is AWESOME for developing and strengthening your core (obliques, trans abdos, etc), and will give you so much stability through your low-back. But unfortunately cardio is really the only way to reduce body fat. Walking (yes, it really can be "enough"), running, x-trainer, swimming, etc are all good cardio workouts.

You're doing so well, keep it up!