My 表姨甥 is around 2.5 years old, he still can't do this too.. my son is 6 months old... I tried to train him when he was 3 months old... so far he poos regularly -- I hold him poo in rubbish bin.
observe what time he poos every day... e.g. afternoon after having his own lunch. Then try to hold him poo in rubbish bin, try to hold for 2-3 minutes and "ng.... ng..." (sound 5 seconds then again)... if he doesn't poo, try again later when it is time to change diapers.
so far my son poos in such way every day... some people say it is not good for young babies, but all my cousins, me, my sis and my husband were brought up in this way...
My 表姨甥 is around 2.5 years old, he still can't do this too.. my son is 6 months old... I tried to train him when he was 3 months old... so far he poos regularly -- I hold him poo in rubbish bin. ...