we have a little boy who's the same age and size.
he showed some fleeting interest in potty training when our baby was born when he was 22 months, but doesn't so much care to go on the potty, although he's become much more "poop conscious" and tells me about it sometimes.
we sometimes have the same problem with diapers.
we use huggies during the day - size 6 - only thing that holds the pee.
we don't restrict liquids - too hot and not good for the system.
we have run into the same problem with the pullup diapers - plus the ones with "woody/buzz" are getting too small even though they say they go up to more weight - they don't.
we use overnight diapers now that have soccer players on them.
i think they're called goodnights.
they're much more absorbent and bigger so they fit better when they're full.
some nights are fuller than others.
we found if we offer him milk when he's up and about at least 2 times during he day and be sure he has access to water all the time, we usually don't have trouble. if all he has is water, it goes through a little faster and we have more water overnight.
i've also found that if we change his diaper first thing in the morning to avoid filling it up with the first morning void as well as the overnight pee, it doesn't leak.
we also had more trouble with leaky diapers when he was in the crib... now that he's in a big boy bed and can get up when he wants, we have less trouble - not sure why.
hope this helps - just knowing somebody else deals with wet bottoms too.
we've decided that we'll wait for him to be ready - all the boys in our families have trained at 3 and done it quickly and well.
but we just had to wait till they're ready.
i know it's possible earlier, but since i'm home w. him and he doesn't have to go for somebody else at daycare, it's no biggie.
our baby is 8 months and he's done much better all around as she's gotten bigger.
when she was tiny - itty bitty - everything was harder for everybody.
amazing what some rest and a regular nap schedule will do for everybody.
hope things get better soon.
s