Hi Sherilee,
At this age, they still need about a pint of milk 500mls a day. This does not have to include just milk but can be a variety of things like milk in cereal, yogurts, cheeses, custards etc.
My DS is also 17 months old and he still has 2 bottles a day 1 of 8oz in the morning - he never usually finishes this one, so I just add the milk to his 1 1/2 Weetabix he has - usually get around 5 oz of milk in there, and then has a 8oz bottle in the evening.
He is not a big fan of cheese, so usually has between 2-3 yogurts a day.
Hope this helps.
Paula