How long can i put my baby (3 mths old) in carrier when out?

Hi Winnie, we got a sleep trainer to assist us for the training. Can't reveal much but u can check out her blog. Her method definite help my Son in his sleep and relieve us of the burden in carrying or rocking him to nap Everyday http://sgsupernanny.com/ http://supernannysg.blogspot.sg/?m=1