Oskar does this, in fact he is 6 months and he is so interested in anythibg that can be moved and he grabs my bra strap and then lets go, to say the least its unpleasant sometime painful. But he has always played with my bra whilst eating, i just saw it as comfort thing it felt like he was nesting, sometimes a give him a lovey and he will cuddle that, but it does depend on his mood.