Re: "I want booby..."
I have tandem nursed 3 times and when a LO asks to nurse after weaning I would just assume that they are checking to make sure they still can. I don't know that I have ever heard of a kid that actually picks up again after months of being weaned. I am sure there are a few that have but they are the exception not the rule. He has a lot of changes right now growing in to a big brother If you are comfortable with him nursing again I say let him. If not just kindly remind him that we have to save the milk for the baby in your tummy and offer snuggles instead.
Just in case.