When my baby is of 2 mts he pass motion every alternate day and now when he turned 3 he do it after 2 days .. is it a concern?

Bowel movement: Babies have different schedules of passing stool, some may poop daily, other may not. But if baby is pooping normal texture stools without help and feeding as per routine no need to worry. Also stool is more pasty and seedy in young babies which may look loose but it's normal in fact. It's the frequency of stools what matters when it comes to diarrhea.

Probably not: How often a healthy infant has a bowel movement can be quite variable - anywhere from once a day to once every several days. What is important to note is that your baby appears healthy and is feeding and sleeping well.