My DS is 24 days old and after Tongue tie/various feeding issues I've been mix feeding him- giving him breast and then topping up with as much formula as he wants. I switched from SMA to Cow and Gate yesterday and last night and today he's been really windy and grizzly after feeds. Is it possible that he doesn't like the brand or is it just coincidence. Very new to Ffeeding but I'm certain we're making the formula up right. Anyone else found this? any ideas?