We recently had a 5wk old piglet drown in its mum's drinker

, i didn't think they were big enough to climb up but lesson learn't i was wrong

, she'd obviously managed to clamber onto the rim and then fell head first in and then couldn't then scramble back out. Awful. For weaners we have an empty cow mineral tub cut down to about 5 inches and use this until they are a good 12 wks old, they then go onto the normal sinks that we use.
HTH
Mandy