Effective and annoying

I came into like 10000 of these bottles before I had my youngest and a large quantity of them just leak for absolutely no reason. It’s SUUUUUPER annoying. However my son has not been colicky or very irritated after any feedings. The bottles in good working order are great however could benefit from less hard to reach nooks and crannies. Makes cleaning and sanitizing difficult and assembly time more stressful with a screaming baby!