Follow on milk is a scam. It’s a marketing strategy and proven to actually be worse for you baby than it does any good. https://www.nutraingredients.com/Article/2013/08/01/WHO-Infant-follow-on-milk-unnecessary-and-inappropriate/
I went to a weaning class at my local family hub on Tuesday and they said follow on milk is completely unnecessary! They said to keep the baby on first milk until a year old then go onto cows milk
Health visitors dont recommend the follow on milk just stick to the first milk until baby is 1 years old
Just change back you don’t need to change to follow on milk x