7abebte therse lots of malls in bangkok you can buy any thing you want for your kids like (MBK,Siam Paragon,Central,Platunam
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if you mean Thai airways its good i tryed it once
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7abebte they put card in your baby carriege so dont worry and when you arrive bangkok you tell them about it they will tell you where to get it,i think with your bags.it happens always with us