How to get away from purees

Caitlin

I know toddlers shouldn't still be eating purees and milk as their primary source of nutrition but our LO is so picky and on the thin side (7th percentile for weight) that I cave and give him a pouch and/or milk after he's turned down the solids we offer. He will eat a few bites of solids but it never seems enough to fill him. Advice on how to move more towards a solid food diet?