I had a Joovy Ultralite Caboose stroller for a 3 yr old and a baby. It worked great until the baby was about 14 months old. The straps did fit her anymore to safely strap her in and she would "submarine" in the seat because she could not be strapped in it properly - she was 90% in height. Also with the older sibling standing or sitting on the little seat in the Joovy with the younger 14 month old child sitting in the stroller it was awkward & heavy to turn the stroller. I had a Bugaboo Frog as a gift and at first it was kind of strange to figure out how to fold it up to put in/out of car but it handles like a charm and will go over any type of terrain imaginable, rough dirt, sand, rocky trails, grass - it goes through it all. It is super-light, has reversible handle bar & seat position and is one stroller I have kept. Buy the infant car seat adapter for whatever infant seat you have and you will have an instant travel system. It is pricey so you might want to check for places for a used one if possible. I have had Graco Metrolite Stroller, the Quatto Tour, Joovy Ultralite, Bob stroller, the Bugaboo Frog, and a Combi. So far the best I have used are the Bugaboo Frog, and the Graco Quattro Tour.
I absolutely recommend the Born Free glass bottles. They are easy to sterilize, prevent baby from taking in air from bottle and overall are great bottles. No problems with them at all, except the price but they are worth it if you have a colicky gassy baby.