Instruct: Classify Amazon reviews into positive or negative sentiment
Query: clean up

These bottles were only ok for my 4 month old son. I don't know that I noticed a big enough change in him spitting up to make it worth it. There is to many little pieces to take apart and clean after each feeding, it takes enough time to clean normal bottles!!! I suggest if your baby is formula fed to use ENFAMIL LIPIL AR. This has reduced his spit up fits by at least 60%