I want to know as well. I have started to train my baby now, but he's only 14 months and I've asked the nurse, they all say, I should start when baby is 1.5 years old...at least he can tell us what he wants.
我女今依家兩歲半,舊年夏天都試過同佢介,不過佢果時好似冇咩意識咁,次次都係瀨左先講,所以擱置左,同埋問過醫生,兩歲半前介都 ok 唔遲,到今年四月再試,果然大個 d 係好好多,兩個禮拜左右,屋企已經唔洗用片,一個月倒出街都唔洗用,依家只係瞓覺先用,我知有 d b 好叻,好早已經介到,不過如果 bb 未介到,媽咪都唔好太心急同失望。