i have one baby of 2 yrs. and i am pregnant of 5 week. i am having severe pain in my back.

It is important that you do not lift your little one from a low position. Sit on a chair or a couch and then lift him on your lap. If you need to carry him avoid carrying for longer than a few minutes a day. Do take care of your posture as most moms tend to slouch and bend especially when caring for a toddler.