Only wants one boob?

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Hello!!

FTM here. My babies pediatrician recommended that I let my little boy nurse at one breast as long as he likes, burp him and then offer the other breast.

Since yesterday he hasn't been wanting the second breast. He falls asleep after the burp and there's nothing that encourages him to wake-up and feed on the other.

He's 9 days old, is that pretty normal?