Hi there, I am going to Mayan Riviera with a 9 mth old and I'm not really sure of what I will need to take. He is on concentrated formula right now but I think it might be easier with powdered. He is not crawling but is rolling around and he is eating a mixture of puree and some finger foods. I know he will definitely eat some sand too as everything goes in his mouth right now. As for the beach, should I just some towels/blanket or a playpen for him to play? I have a good lightweight stroller and will bring some small new toys. Based on your experiences, what do I absolutely need? or any tips are appreciated.