Re: possible weight loss? feeding guidelines...
You can google "toddler nutrition guidelines" or phrases like that and see the recommendations for yourself. I don't want to post any of them because they vary, and I honestly don't think they are particularly useful for young breastfed babies in the first place. As my pediatrician says, until a year breastmilk alone meets all a baby's nutritional needs, and after a year solids become an important part of the toddler diet, but the transition from needing only mama's milk to needing a lot of solids is a gradual one, with many breastfed babies not eating much in the way of solid food until well into their second year. Most of the guidelines recommend a much, much larger quantity of solid food than my children ate- and my kids were HUGE toddlers!- while also bemoaning the epidemic of childhood obesity. That irony is good for a laugh, at least.
If your LO can't fit into his September clothes, then I am sure the issue here is the scale.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"