@Rebecca he’s only 22 lbs I read the size 3 is for toddlers
Are you fitting it tight to his foot can you put in on looser?…I always Make sure I can slide my finger between the strap and the part that goes by the ankle? If not then I’d size up xx
A toddler can be 22 lbs. I would go based on size not weight. He could also have chunky feet. I wouldn’t want it tight on his foot. I’ve heard of those socks causing pressure ulcers. Wouldn’t want to risk it.
I would try size 3 see how fits this is what we did when the first size sock got too small.