Is it weird for a 10 year old to drink milk from bottle?

Yes, it could be considered unusual for a 10-year-old to drink milk from a bottle. While it is not strictly harmful, most children transition from bottles to sippy cups and then regular cups by the age of 3 or 4. If your child is still using a bottle at the age of 10, it is advisable to talk to a pediatrician or a developmental specialist to explore any potential underlying issues or developmental delays.