Best batting for baby quilt - polyester or cotton

Hi all

I really need your help here - I am out of my depth. Very good friend has
just become a grandmother and asked me to make a baby quilt for her new
grandson. Now, babies - let alone baby quilts - are not my favourite
things - so I am swimming in deep water vbg.

I have made what is probably a totally unsuitable top (hoffman panel with
bears and ducks and other stuff) and made it a bit larger with a final
border of scrapy four patches. The back is my interpretation of a baby quilt
12 x 14 3" rail fence blocks in barn-raising layout in shades of blue yellow
and turqoise with a large turqoise border around the outside to make is the
same size (more or less) as the front.

Now to my question:

Is cotton or poly batt better - and why?

I have both and don't quite know what to do next. The quilt will be used in
England if temparatures make a difference.

Help ....


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Cheers for now
Tutu
Cape Town, South Africa