Our little one started sleeping 7 hour stretches around that same time too. I was told by the pedi that I no longer had to wake him for feeding during the night. Just blessed to have a good sleeper!
Ours started STTN around the same time, maybe a little bit sooner even, yes, it's normal as long as they are gaining weight. Congrats on your good sleeper!
Mine just started STTN about a week ago...so they were 10 weeks. Being preemies I figured it would come later. I'm so excited now. DS sleeps a solid 8 hours. DD sleeps anywhere from 7-10.
My LO is only a few days older than yours and he has nights where he will sleep almost completely over night like that, I wouldn't think it's anything to be concerned about as long as he/ she is eating well during the day and has a good diaper count, weight gain, etc., etc. You're very lucky!
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Re: Sleeping overnight