My baby is 4 weeks old and at just under 3 he developed bad constipation. His tummy swelled up, he cried for 3 days straight and he was seen at the walk in. They told us to swap his milk to constipation and colic milk which we have done and cut his feeds down to 3oz as he was having 4oz. He is now starving and we have upped his food back to 4oz and he takes what he needs depending on his hunger. Ever since doing this he don’t settkrcst night. Last night I was at my wits end with no sleep and I gave him the normal cow and gate milk not his constipation one. He slept for 3-4 hour stretches. I’m wondering if I can mix up this formula? He is not ready to be back fully on regular milk but if it’s the same brand do you think it’s ok to use his constipation milk for regular feeds and normal milk for two night feeds?