How do I divide thyself?

Becks and Mong are growing up fast, physically. They weigh about 18 and 12kg respectively and have been clamouring for my attention of late. "Mummy, carry me!" They'd cry out in unison.

So...do I take turns? Who do I pick up first without the other feeling jealous? How do I minimize my physical damage (the soreness on my left is started to throb, the first since my surgery)? How do I not do it excessively so as to encourage?

2 (kids) is truly enough...................