phil n teds double buggy - 2 yr old and BIG 10 weeker?

[boompi]

Need a double buggy(or I will never leave the house!) and think PHil n Teds is way to go.
My dd is 2 and tall for her age and ds is 10 weeks and on 99th percentile for height. Is he going to fit into the newborn lying down bit before he can sit up?
Also surely he can sit up before 6 months (as it suggests on phil and teds website)?

I've pushed a 7 year old (admittedly skinny) comfortably in my P&T. They can sit in the little seat before 6 month,yes.

DS lasted til just over 4mths lying flat and he's also 99th centile weight & height (10lbs9oz at birth) If you get a Phil & Teds Sport (new version) the rear seat reclines and they look v comfy in there with a headhugger.

DD could fit into either seat at 3.2 and she's pretty tall too.

DS2 is a big boy (not sure of his weight but he is very heavy). He never seemed too comfortable in the baby bit and looked squashed from early on, so have not used my P&T much. Am about to try him in the baby seat - he is 5 months now. Can you go along to Mothercare and try one out?