My DS is nearly 7mths. I started introducing solids @ 4.5mths, following the GF weaning book as a guide as he is a GF baby. The problem is that he tends to follow the spoonful of whatever food I am giving him with sucking his thumb (left or right he doesn't care). I have him in a high chair and the harness helps prevent his messy hands from coming into wider contacts, but he still makes an awful mess of himself.
At first I wasn't concerned, thinking that at least he ate everything I gave him, but after more than a couple of months of this I am starting to worry. My PIL's are freaked out whenever they see him at meal times. It seems to be worse when he is tired. If he is really hungry and is having one of his favourite foods then he only puts the thumb in briefly and then withdraws it quickly to get the next spoonful, but if he is tired and doesn't particularly like the meal than I extract his thumb with a resounding pop and insert the spoon - which is inevitably quickly followed by the replacement of the thumb. I try to prevent his thumbs from making it back in but with juggling spoon, bowl and two quick little hands I haven't had much success.
I think I might have trouble buying a strait jacket in his size so any suggestions will be gratefully received.