I tried potty training for my 23 months toddler but my trials failed. when should i start trying again?

Potty training: If your toddler is a boy i would wait abour six months unless he is showing an inclination to stay dry. If your toddler is a girl you might try again in 3-4 months.

Wait until ready: He/she may not be developmentally ready for potty training yet. Children need some core skills in order to potty train easily: able to say, 'i need to go potty' or the like, able to pull down/back up pants independently, wakes up dry in the morning. Without these skills it will be more difficult, so waiting is best. Most children potty train between 2 and 4, so there is a broad range of normal.

A toddler who walks: from room to room, pulls his/her pants & pull-up or underpants up & down & says " pee-pee", "poo-poo" or "potty" to indicate he/she senses the urge to "go" is ready for daytime toilet training. If not, you may create a behavior problem . There's no harm in putting a potty chair in the bathroom for the child to sit on while you model using the toilet, but don't force the child to sit on it.