I have not started the cereal personally, but my brother and sister in law have Dr. Brown bottles and just went up to higher lever nipples. Seemed to work for them.
We use Dr. Browns bottles and just use #2 nipples with her rice cereal. They actually make a special Y-cut nipple for rice cereal but we have found that #2 work just fine.
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Re: Dr. Brown's bottle and rice cereal?