Supplementing with formula

Feeling very discouraged today. I know fed is best but I still feel guilty and sad that we have to start supplementing with formula.

My daughter had her 4 month check up today and didn’t double birth weight so our dr wants us to start supplementing.

I’m sad because I actually have a good supply (had an oversupply for quite a while actually) but she still isn’t gaining the weight she needs to.

So I don’t know what went wrong and I’m just beating myself up because I actually love breastfeeding 😥

Anyone else had this happen? We have to use a soy formula because she has a dairy sensitivity on top of this. She also has a lip tie we need to get evaluated so maybe that will help.