1 month ago on 02/27/2020 at 8:42 AM

Can anyone help? I have a almost 4month old and had to switch her formula to Enfamil AR nearby Park Ridge. She has not spit up since we changed yesterday but she seems to be getting frustrated because she eats slower and the formula starts to thicken while in the bottle. I changed to a medium flow nipple but she still seems aggravated. Anyone use this and have this problem or have any ideas of how to fix it. I added a little more water once it gets thick. Changed the nipples, Tried room temp water, I have never used formula before. Thanks