My lo is coming up to 18 months and he has a 5oz bottle in the morning about 6.45isham which he gives himself. He has his porridge/weetabix etc at 8am. He did have 6oz but he started to cut back on his solid so I just knocked an oz off and at this stage it worked.
He doesn't have any other milk to drink through the day except at 7pm bottle for bed where he has anything between 5-9oz and this usually depends on how much he's liked my choice for his dinner!