Delos weighs 17.9 lbs. Height is 28 in. Head circumference is 43 cm. He passed everything he was…

Delos weighs 17.9 lbs. Height is 28 in. Head circumference is 43 cm. He passed everything he was supposed to today. They want him to see a neurologist for his head growth even though it is growing slowly. They also want him off his "bottle" (pediasure bottle with a nipple) in 2 months. Idk how we are gonna do that because his brother is gonna be here in 31 days and he's just gonna regress. We keep trying a sippy cup for it and it doesn't work. Need help or advice on how to do that please. Other than that he is great! He goes back in in 2 months for a weight check.