Lactum is a good choice. My baby is only 1 year and 4 months but he's weighing 14kgs, much heavier than his cousin 4 year old. He's very active and very smart
I think Lactum is sweeter compared to other milk brands, so yes, it's an ideal milk for the happiness of a kid
I've heard that Lactum is a good choice for picky eaters. So yes, that's a great choice of yours.