Another "skinny seat" is the Sunshine Kids Radian, we have it in the middle of our Corolla for 2 year old ds. It's great.

we have had our 3 seats in a variety of cars (including a 3 door corsa)
have you tried putting your 18m old in the middle and the baby seats at either side?

apparently the multimac seats are very safe.
they're swedish i believe, and as we know in sweden they are very, very big on in-car safety for kids.

Never heard of multimac seats before.

What a great idea!

Interesting to know if anyone has used them and what they think.

Multimac car seats aren't cheap, but possibly cheaper than replacing the car? I haven't used them so can not recommend them. You would need to do your own research on their suitability.

Have you tried a different seat for your 18 month old? Britax tend to be narrow.

have you tried them in differant orders?

our 3 only fit in in a specific sequence and even then you have to break your hand tying the seatbelts and ds2's seat gets a fair bash from the door.

no idea what we'll do when he needs a bigger seat!

if you have no airbag (or can get a switch fitted to turn it off) then have one of the baby seats in the front.

I have the same combination as you - and to be honest it doesn't get any easier to fit all three seats across the back (mine are 7 and 6 now) - we ended up going for a bigger car (in our case a vw touran - but even then they are a tight squeeze.

If you get the airbag disconnected will you be able to fit one dc in the front then?

why can't you move one to the front?

that's what we have to do.