I believe one is an infant formula and one is a toddler. I wouldn't swap until at least 1 year, but honestly after a year- formula isn't necessary. Their bodies finally have the digestive enzymes to take what they need from the food they eat. A well balanced diet is all that is necessary. "Toddler" formula is just another marketing plan to make money off parents longer.

Hope someone answers. I get them too but dont know if I should switch either