Has this happened to anyone else’s baby?

Hey mommas! Just posting on here to get some insight. My daughter is 15 weeks old and has exclusively only had breast milk. Well we recently have had to introduce some formula (maybe 1 to 2 bottles a day), I just can’t keep up with the supply and demand lol. Anyways since we’ve started she has been having sooo many poopey diapers. When she was just having breast milk she’d poop once maybe twice a day, since starting the formula she’s currently having 6 to 7 a day. She’s perfectly fine otherwise, not fussy or cranky. She has been getting a little rash but what baby wouldn’t after shittin that many times a day lol. Anywho my question is, is this normal? Her dr recommend the brand we have her own but I just feel horrible that she’s going so many times a day. She still has plenty of wet diapers a day so I know she isn’t dehydrated. Just wanting to know if this has happened to any other mommas?

Thanks in advanced ladies 🤗