playmat are mostly 1cm thick.. does it help to cushion the pain if baby fall when crawling?

Yes, cushion to a certain extent.... When a baby loses balance while crawling it may not hurt. Most likely will be shocked. But when the baby sists upright and falls sideways or backwards it may hurt. So it helps to put bolsters or cushions around the baby's zone. I space it so that if baby falls the pillow catches the neck/ head, not back. Pretend the blue raccoon is the baby in photo

To some extent. There are some 1.5-1.8cm thick ones online:) I find those much better

As baby grow bigger,crawl better , can use thinner baby mat

I think mine is quite thick around 3cm

Parklon may cost a few hundred dollars

Best to buy online with coupon codes

Yes that's good enough for crawling

yes, to a certain extent

benefit to some extent

Parklon is good