In the UK, there is a commonly diagnosed condition called, simply,  toddler
diarrhoea. It happens in bf and non bf toddlers. Mothers are reassured that
it's just a very active lower intestine, due to gut immaturity,  which is
regarded as having no significance at all in an otherwise healthy child.
That is of course the key - if the kid is growing and happy and eating and
drinking normally, what on earth is the problem?

(Speaking from experience here - middle child couldn't go anywhere without
a change of trousers after the age of six months until toilet training.  No
nappy known to mankind could have contained his liquid explosions.)

Heather Welford Neil
NCT bfc Newcastle upon Tyne UK