Daven while your baby naps, as you will be able to concentrate then. I find it hard to daven with proper kavana and keep an eye on my kids at the same time.
While you are playing with and feeding your baby keep in mind that THIS is what Hashem wants you to be doing. Don’t feel bad or guilty that you can’t be in shul, and you should have a beautiful yom tov. Good luck and welcome to motherhood!