@Leah what sort of split do you do?
Formulas are all tightly regulated so you can use anyone you like. Personally I’d look for one I can get hold of easily- one that’s always in a local shop incase you run out. I’m breastfeeding but my daughter gets a bottle of formula at night so I can go to bed earlier x
So I don’t mix the two together but what I tend to do is give baby some breast when I know she’s start to fuss and give her as much as she can but she tends to get impatient and then I give her between 120-140mls of SMA!
I’m currently combi feeding with breastfeeding and SMA pro formula! Seems to be working with my little one. She’ll be nearly 1 month on Saturday and we haven’t had any issues!