INFANTS AND CHILDREN
Q: At what age can you start consuming Oatly?
A: Oatly plain drinks can be used in cooking for most babies over 6 months of age. Usually, they are suitable as a main drink after 2 years of age. However, following a dietetic assessment, it may be decided that they are suitable after 1 year of age.
If you want further information The British Dietetic Association give useful information here, where it says, Oat or other milk alternative:
"may be used as a main milk drink after two years of age...However if dietary intake is adequate your dietitian may change this to an alternative milk after the age of one."