Can I breastfeed after chemotherapy?

Yes. When to rebegin nursing your baby depends upon the type of chemotherapy you received. You will be able to nurse again, but you should contact your oncologist and also your pediatrician and lactation specialist to determine the time.
Yes. In many circumstances, it's safe to nurse-- but it depends on the timing, when you finished chemo, and what medications were used. You should ask your oncologist about your specific situation.