Hi Sook,
Re: Latex Mattres
The risk of cot death (SIDS, crib death) can be eliminated by ensuring that babies sleep on mattresses known to be free from the elements phosphorus, arsenic and antimony (and using only certain specified bedding). The BabeSafe range of bassinet and cot mattresses complies with this requirement.
Extracted from the website:
http://www.babesafe.com/
For the foam mattress that come wth the cot, if u r unsure abt the material used (whether it consist of those element mentioned above), think it is better not to placed below the babesafe mattress.
Re: ventilation Hole on BabeSafe mattress
Think the tiny holes is just to promote ventilation and cooling effect.
Baby Safe Latex mattress:
http://www.babysafe.com.sg/tipsnadvices.html#2
Safe & 100% natural Contains no formaldehyde, no toxic substance and emits no fumes.
Anti allergenic Anti bacterial, mold free, dust free, dust mite free making it safe for the respiratory system.
Gives good support Uniform cushioning, no sags, fluff or depression. Flat, firm and highly resilience ~ resumes shape immediately.
Moisture resistance - cooler & more comfortable to sleep The Open Cell Structure and millions of breathable tiny air holes effectively ventilate body heat and humidity.
Durable & easy to care Officially passed the durability test according to the international German standard.
Use of 100% cotton coverings in all products for better comfort Allow moisture to permeate and escape instead of trapping it.