Sick after bottle of cows milk! Help

my boy is 2 in a week! He absolutely loves his bottle and he’s been sick, projectile vomited after both bottles today! I couldn’t give him his night time one as he Would just throw it straight back up! Within 10 minutes he did earlier! I thought it was a bug, but he’s ate day to day stuff, even had crossiants cheese which is dairy so Im Really confused to what it could be! Never ever had a problem with any food or drink with him!! Any ideas? I’m going to try him with one in the morning but I feel mean if I know it’s going to make him sick!