It's just his recommendation. You can speak to him about your concerns after he shares with u about the pros n cons. Like what the ladies mentioned, it's good to read up about it n then make a decision with ur hb before ET but gotta be flexible about it. For me, we have already made up our mind for single embryo transfer for both cycles. For my first cycle, although we had a single embryo transfer, we were blessed with a baby boy. But since Dr tan n the embryologist recommended transferring 2 for my recent 2nd cycle as the quality isn't as good then we decided to just follow their recommendation that was made based on their professional judgement.