Cosatto state it is suitable for use from 6 months however as it has 3 recline positions including lay flat I have been able to use it comfortably with Harry (10 weeks) already.
The seat is light weight 2.51kg making it very easy to lift on and off of the chassis and can be used in parent and world facing modes. It comes with a cosy toes with is reversible in a 4 way option so you can easily change the look of this pushchair to suit your mood.
In the back of the seat unit are 2 largish pockets which are great for holding your keys, phone, nappy wipes and a snack if you don't want to take out your changing bag.
The seat unit can be reclined using the large Green press buttons on the side, you need to press both in at the same time and then recline or sit up again by pressing or pulling the frame.
It attaches onto the chassis in the same way the carrycot does, by clipping it into the long posts located on the side of the frame. To remove again you press in the buttons located under the Green ones used to recline - these are rather small so takes some getting used to and some practise.
I have been using the seat unit in parent facing mode with Harry in the fully reclined position and he seems to really like it - he keeps staring at the tree design of the hood and seems very comfortable. The padded chest pads stop the straps from rubbing on his neck and he has plenty of room (well I should hope so as he is only 10 weeks old).
The cosy toes makes it very padded and comfy for him however he is yet to fall asleep in it as he is too busy staring at the trees on the patterned hood.
He hood is large and can be put up and taken down almost silently so should he fall asleep it wouldn't wake him up.
I have a problem with the seat when it comes to using with my daughter who is 2 years and 10 months, so not yet able to walk everywhere. The seat is narrow and not very deep so it will not accommodate Emmy comfortably.
As you can see her feet are at the bottom of the cosy toes so over hang the foot rest and her head over shoots the top of the frame. I had put her in the buggy so I could walk her to sleep however this wouldn't happen as she wasn't very comfy.
Now Emmy is tall however no taller than all her friends of the same age and can still fit into some aged 18-24 month old clothes and the rest are all aged 2-3 years.
While I love this buggy for Harry it isn't as versatile as I had hoped as I can't use it for occasional use with Emmy.