Marlea - It is me who mixes the formulas - and it works a treat. Controls the reflux/colic - yet is not too thick. As you say, so long as they are the same formula - it should not be a problem. If necessary phone the Maternal health line 13 22 29 or the nurses line 1300 60 60 24 to confirm it. It is worth trying anything until you find what works best. And you're right - DH's have no clue at all. I have threatened my hubby that I will go back to work on Saturdays and he has to take care of Shaun all by himself!! He is starting to understand what I go through during the day. Last night, I was doing a heap of washing, cleaning & sterilising bottles, making formula, doing the dishes (including my sisters mess that she left), making some 'snack' dinner, settling & feeding Shaun - all after going to gym. Then hubby was still hungry, so I popped on the grilller to make him some hamburgers, and whilst the grill was warming up I came in to reply to an email and he cracked it with me for being on the internet! He dragged himself off the couch and said "he was hungry" and I should be making his dinner! I nearly knocked him out. I let loose and sarcastic! I said "I'm sorry - do you want your feet rubbed - I've got a few spare minutes!!" In the end, he realised he was sooooo wrong and he gave me a big hug and apology.