My son is 8 months old taking sma progress. However, he keeps becoming constipated and my mum tells me that I should switch to cows or goats milk. Can anyone give me their views please as I know in days gone by cows milk was introduced as early as 6 months. Can I even juggle with cows milk and formula? I'm sure he will not have a reaction because I put milk in his cereal anyway. I am finding it a real nail biting decision. thank you