Lifting at 1 wk pp

When did you start picking up your older babies. I have a 1 yr old and 2 yr old that weigh 20 and 33 lbs. I'm 1 wk pp with a 8 lb baby. I picked my older babies up only when necessary since I have been home like 2 days after delivery.. like redirecting or diaper changes or getting in high chairs baths..etc. it hurts sometimes and I notice more bleeding when doing more but I dont have much of a choice. Will it take longer than 6 weeks to recover? Why do they say if you have increased bleeding your doing too much?... doesnt the bleeding mean your uterus in contracting and going back to normal size?