I have let bb to use Piegon 學習杯 to drink water when since 4- months old. Now, she recognize that the cup is use to drink water and milk bottle is use to drink milk. Even I use the cup to let her drink milk, she just drink for fews only.
Marcus doesn't like to drink water/juice from milk bottle...he will push out the bottle...but will drink the water/juice if we feed him by spoon...just in case he is v thirsty that he uses the milk bottle for liquid other than milk...seems telling us that milk bottle is just for drinking milk!
my 3.5yr nephew was still using milk bottle to drink milk!
My son likes water very much and each time can finish 3-4 oz. I tried the training cup but he refused, because he likes biting the teat while drinking water.