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I would persist with the milk a little longer. If it’s becoming clear the baby won’t have it, try a different brand. I started mine on sma but she wouldn’t have it, then moved to aptimil and went down a treat x
I give my lo probiotics whenever she has antibiotics because antibiotics ruin your gut flora. Give it a few weeks and if struggling still look at other underlying causes like tongue tie, tension etc.
Probiotics can help with the digestive system so for things like gas and constipation. Some formulas already have them in so check the brand you’re going for as they might already be in it