Hi there I have a question about giving my 17m...

Hi there I have a question about giving my 17mnt old tea with milk. He has a sip of mine occasionaly(only a very small sip) he really enjoys it. Do you think if I gave him very light tea with lot's of milk it would be o.k? Only in the morning as he doesn't really like plain milk. My concern is the caffeine content, but have heard there isn't enough in there to cause any harm what do you think? guess i can always give decaffenated tea.