How can I treat sagging skin after pregnancy?

Cocobutter lotion. It will take some time but when you are ready, consistent sit-ups and coconut butter lotion will alleviate some of the lax tissue that can follow pregnancies.
Avoid sunburns. Use a good spf and moisturizer if you are going to be in the sun and if it works well for you, thank your mother. A lot of our skin qualities are due to genetics and ethnic backgrounds!