Hi mama, at 1.5 years old, full-cream cow's milk/UHT milk can be a suitable option if your little one doesn't have a dairy allergy and is growing well. 😊
Since he's been exclusively breastfed and is a picky eater, you may want to introduce the new milk gradually before childcare starts. Some toddlers take time to adjust to a different taste, but many eventually do.
If you're concerned about his nutrition or poor solid intake, it's worth discussing with your pediatrician as they can advise whether a growing-up milk or other nutritional support may be beneficial. ❤️