So, my YDD is currently 3.5 months and about 16 pounds and I guessing about 26 inches long based on how clothes are fitting her. I am looking for suggestions for convertibles for her. I have 3 cars that I want seats for a Scion xB, a Subaru Outback and a Toyota Sienna. I'm thinking the Scenera Next would be a good choices for the Outback and the xB. She doesn't ride very often in the Subaru and the xB she will ride in about 3 times a week. She will ride in the Sienna pretty much everyday and I drive to work 3 days a week and she goes to a sitter near my work which is about a 30 minutes drive without traffic and pretty much all highway driving. I thinking since she is so chubby I will probably want an Extend to fit. I would like to RF until at 3 years old. I would prefer something more low profile but I'm afraid that 40 pounds RF won't get her until 3. She is super chubby like my DS was and he was 35 pounds at 2.