My son is 3.4 and has been potty training for a few days now! He is doing really well,wees in both the potty and the toilet-however pooping is another issue. He will eventually do so,but before and after he is leaking little bits out into his pants-he did this when he wore nappies. Any idea why this happens? His diet is pretty good but do struggle to get him to eat veg and he won't do fruit at all.