S.H.
Two people mentioned the air bubbles but did not tell you the simple solution to that is to stir it not shake it. Air is significantly less. You can make it ahead but that leads to a lot of logistics if going out and then having to heat it up. Try stirring it. Some friends also just recently told me that Parent's Choice at Walmart is working great for their son. They did some research and found it was a good quality formula. Their son has much trouble with Enfamil! That had some given to them and couldn't use it. They had to go back to Parent's Choice.