Baby that has been staying with us for a few months is going home next week. He is four months and almost 30lbs. I would love to buy a convertible for him as he is close to outgrowing his bucket by weight. It would have to be something I can pick up locally in Dallas or do prime shipping on Amazon. Any suggestions? None of my older kids were close to that weight at that age and the seats out now are completely different than 5-10 years ago. I'm lost.