Washing and assemble Dr. Brown bottles are very troublesome. I give up using it and buy another set - Avent. AVent is much more convenience and it also has anti colic function.
I am using both Nuk & Dr. Brown.
I find my baby is more relaxed and drinking better when suing Dr. Brown's bottle.
My baby started using Dr. Brown at around 1.5 months old. She tried the first level, but the flow was too slow for her. After switching to Level 2, she's drinking very well.
Beware that Dr. Brown is always on 30% off at Mothercare or other retail store. So don't buy it yet if u don't see it on sale.
My 2mth old daughter used Dr. Brown bottle with level 2 nipple today. It is the first time of using Dr Brown. Agreed with Jamom that she is obviously more relaxed and seems comfortable when drinking the milk. No leakage of milk from her mouth during the feeding. I think i will change to Brown very soon.