The sister is four months on the way. Soon another little one will bring smile and happiness in their house. She is thinking of buying a mattress for her son to sleep on when the new baby is born. Her first baby ( a son) sleeps beside her. But when the new angel comes, the son will soon sleeps with his father. That is why the sister needs a new mattress for his son and her husband. Her son is very sensitive when it comes to mattress. The asthma symptoms will attack him if the mattress is dusty. I guess the sister needs to buy a hypoallergenic mattress like latex mattress. Perfect mattress for her son. Also, very much comfortable. She can even put their new baby because it is comfortable and hypoallergenic.