Milk for 1 year old

My baby just turned 1 and the polyclinic doctor mentioned I could start introducing UHT milk. For my baby doctor says I can give 500-750mls of milk/day. I thought formula milk is better since it has all the necessary vitamins for baby? Anybody still gives formula milk? And how much are you giving? I noticed the recommendation on the formula tin says 2 feeds per day. But I feel that’s too little? My baby is on the smaller side, 8kg, polyclinic nurse says it’s fine. So I thought the formula milk would be a good supplement for weight gain