Ever since I switched to the minksheen shampoo and use my biolage hydrating conditioner, I have not had the matting problem. The babies hair is soft shiny, smells very nice and does not matt under clothes.
A bottle of minksheen has lasted me almost a year, I ordered it off of petedge.com. I buy Biolage at my salon. It's very gentle. I still use baby shampoo around their eyes.
Hope this helps!