I started to switch my daughter over to solids at 1 year old and it took a few months for it to completely happen. She just wasn't ready to chew all the time and wanted to be feed mashed up foods sometimes. With the bottles, I think it's fine... I started weaning off formula at 11 months so by 1 year she was on milk. My daughter was getting an 8oz before naptime in the afternoon and 8oz before bedtime. Also for when you switch from bottle to sippy cups... The Nuby one seems to be the best! The soft nipple helped with switch and my daughter loves them!