what milk bottle do you use? Have you tried Dr Brown bottles (you can buy from Wing On, Sogo, Be Be Dreams and many places)?
When my baby was a newborn, I used pigeon for one month. Very difficult to 掃風 and baby drink very slow. I tried Dr Brown and he drank much faster and very, very easy to 掃風. My baby has used it from2 months to now (1.5 years old).