What are double and quadruple marker testing in pregnancy? #screening #pregnancy

Do these tests say about the preterm delivery of the baby other than the information shared in the video

My 10 month old boy baby loses 300 gram after he had vaccine fever, cold and cough but during that illness he ate well why he lost weight sir is there any other problem ??

Dr mera baby 20 month old hain...saliva bahut jada aa raha hain baby ke muh se .what the reason sir

Respected sir can i get your email ID sir
I need advice regarding national neonatology forum fellowship in Neonatology in Uae.

Sar my wife pagnesi 4month fast 8week repot all normal n blod taste repot all normal n 14week usg n quadruple taste usg repot my baby all normal baby NT 1.1mm this my fast baby hamara dono family mie koe vie abnormal baby nahie hie kie vie bimarie nahie hie my wife my wife age 36 kay quadruple repot mie baby low risk ayiga

my 23rd week is complete. Can I still get this test done? Bcz it should be done between 18-20week