Can I add more baby formula to make the bottle thicker?

You can add a little bit of rice cereal to the formula bottles to thicken them up. I did it with my son and it worked great. If I made a six ounce bottle for him I would add a scoop of rice cereal. I kept an empty formula canister that I would pour the rice cereal into so that made measuring easy. Try it and see if it works with your baby. Good luck.