There’s a lot of advice out there about how to tell your child he or she is going to be a big brother or sister, and most of it assumes that kids are going to be upset when they find out they’re no longer going to be an only. We don’t know if Sarah Bromby read any of that advice before telling her five-year-old son he was going to be a big brother, but if she did, she needn’t have worried. His reaction is not only reassuring, it’s utterly heartwarming and totally adorable. Watch what he does!