The reason I had to no sitting on my lap rule is because I reserved that as a special thing for my daughter only. She was 10 months when I began daycare and she struggled with sharing me. This was the one thing that was reserved only for her. Other kids were held when needed, cuddled, hugged etc. I would sometimes pick up the little ones and put them on my lap but I was the one who allowed it and not because a child asked. My daughter is now 5 and I find this is still our special bond when she feels the need and is tired of the little daycare kids. It wasn't her choice to have daycare so I find it important that we have our little thing even if it is just her being the only one who is allowed to sit on me.