When will parents and grandparents stop making comparisons on the different milestones that children make?? So sad, Every child is different - that is what makes us all so human, and the age at which they have control of bladder/bowel, able to walk, jump, ride a bike, etc. read, write, do maths is so varied, and rarely had any sort of on-going meaning. My son, fluently, very, very early - so.....was considered Gifted in Primary school, went on to get a reasonable degree and job, but nothing much. My twin girls did not say a word until they were turned two and a half, both went on to good firsts and MA's.
Bladder and bowel control both daytime and night are very individual. As has been said here, if a child sleeps very deeply, as my youngest son did, then no way will a full bladder wake him. Knew a friends son, who at the age of about 11 years old they were told by GP to use an alarm system in his bed, he wet, off went the alarm, whole family woke up, except him!!!
Please stop these comparisons.......as long as child is making progress along proper route (ie doing things in line, not at particular times), and is happy in their lives, that is all that matters.
We had several so-called 'dry at night' foster children who (as I expected they would) became wet at night due to the sudden changes in their young lives. Always treated with respect and not made a great thing about. Once they settled down, they usually started to become dry again, but not all of them.