Posted in my bumpers group but thought it would be helpful for a wider audience:

We just had our 9 month checkup yesterday. We have plans to travel to anti-vax territory around my son’s 1 year birthday and I asked about getting his 1y vaccines before the trip due to the crazy outbreaks this year. She said we could go ahead and get the MMR now for peace of mind. We will have to get it again after he turns 1y for it to “count,” so it is an extra shot. For those curious, the reason it’s not recommended early is because babies can still have passive immunity from the mother. The vaccine isn’t considered completely effective until 1y when there are no more antibodies left to interfere with the vaccine. The closer to 1y, the more effective it would be. You have to wait 28 days between doses and they will require after 1y regardless of whether or not you get an early shot.

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Something to consider if you live near an outbreak area or have travel plans. I had no idea it was even an option to get the vaccine early.