Helmet for plagiocephaly at 9 months - too late?

[Lagirl20]

My son had moderate plagiocephaly. I am considering a helmet. Keen to hear from any parents who got one at 9 months or later - did you see results? Thanks in advance

I know this isn’t what you asked but my son had this and we instead saw a chiropractor and put a lot of time into keeping him from lying on his back (apart from when sleeping) and it largely resolved itself. His was quite bad but I was told we had until 18 months to make a difference and it was fine.

Do it