DD is 22months and about 80th centile height and 95th centile for weight. She eats very well but I don't give her lots of sugary snacks and she has berries or raisins for pudding. She has 12oz of full fat milk per day plus whatever dairy she eats.
I don't think she'd waste away if she moved to semi-skimmed, but I don't know enough about the difference in nutrients between full fat and semi-skimmed to make the change.
I'd be grateful for advice, partic. from someone who knows the facts.