So long as you 3yo still fits heightwise (ie shoulders no more then 2.5cm above top shoulder strap) as although officially they put 'up to 18kgs' on the seats for inbuilt 5pt harnesses they are tested with 22kgs test dummies, I would continue to use the Ezy Combo in 5pt harness mode.http://www.ntc.gov.au/filemedia/bulletins/...ildrenFeb08.pdf
A child restraint is technically safe for 97% of children up to 4 years old based on their 22kg test rating.http://www.infa-secure.com.au/faqs/index.p...&artlang=en
forward-facing (Type B) child restraints with an inbuilt harness are tested above the recommended weight (18kg) with a 22 kg dummy used which is equivelent to an average 6 year old child.http://www.childrestraints.co.nz/documents...ax_Bulletin.pdf
Convertibles and Convertible Booster seats provide a harness for children up to 18 kg. These
seats are tested to 22 kg so staying in them a little longer, say to 20 kg will not overload the seat **
(** we cannot recommend these higher weights for occupants but we can tell the consumer
that they are tested to this weight.)
The above is why the 2010 standard seats now have height markers rather then weight limits as mentioned above 97% of 4yo are below 22kgs in weight (which is what the seats are tested to.
As for bubs, personal preference is for New 2010 Standard SnS Compaq. It has nice high RF and FF markers so will last longer in both modes compared to other seats (even the Meridian).
As you saw CREP are behind the times with all the new 2010 standard seats out on the Market.