1.What age/size/weight is the SkyBaby mattress suitable for?

SkyBaby mattress is aimed at babies under 2, who don’t generally get their own seat on an aeroplane. Other than that we don’t give a recommended age range or age limit for SkyBaby because it depends on individual babies, for some babies it is too small after 4 months and for others it is fine right up until around 20-24 months.
The SkyBaby  is 56cm long, this is roughly the width of the average airline seat. Two pictures are included below.  One shows a baby around 3 months old (wearing a white sleep suit).  This baby is using the SkyBaby as a full mattress, lying across the width of the seat.  The second picture shows a 10-month old baby.  You’ll see that the mattress finishes around the bottom area, and the mattress is being used on a diagonal angle across mum’s knee because the baby is taller.  The baby’s legs dangle over the edge of the mattress.
The main thing really is if the baby is happy to sleep on your knee, or if they want to be up exploring!  Also, if you have a very large baby the general confines of the seating area on an aeroplane may mean they wouldn’t be comfortable lying down on your knee regardless of whether you have the mattress or not.
You shouldn’t have any problems with the width of SkyBaby mattress, it’s 29cm wide, so can accommodate most babies, and the wings can expand around the baby on an elastic strap, or you can choose not to use them.
The other thing that might come into play is if you’re travelling during baby’s normal sleeping times, e.g. they may be more inclined to sleep on your knee.  Or if you’re travelling on a long-haul flight they may be more likely to want to sleep for at least part of the journey.

2. Can I use the SkyBaby during take-off?

Yes, and the SkyBaby is particularly useful in this way because you can carry your sleeping baby (hopefully!) off the aircraft on the SkyBaby baby travel mattress.
The SkyBaby mattress allows you to fasten the airline infant belt around Baby as normal (if your airline uses infant belts – some don’t). You can move baby to a sitting position (see the image below) during takeoff/landing/turbulence with the airline belt in place.
However, the use of any item on board the aircraft is at the discretion of the crew, and there may be particular circumstances, e.g. during turbulence, that you may be asked to put the product out of use for a time. At such times, even bassinets provided by the airline are not used.