I'm going to start weaning my almost 7th month old off the boobs as I'm going back to work soon & can't be dealing with expressing all the time. He has had formula milk before, usually the pre made stuff as it's been used when we went to a wedding or we were going out & I forgot to express. He's not fussy about his milk, as long as he gets it! However, as he will be using formula milk more often should I get the follow on milk or the infant milk still?