Just seeking some advice in advance.
My dd is perfectly healthy but grows naturally slowly (1 lb a month or so). As a result she toes a line then drifted down, found another line then again drifted down slightly over Xmas. She was born between 25th/9th percentile line- now about 5th or 6th percentile. So not crossed 2 lines. HV are not concerned as they think she just gains slowly: she is extremely strong and energetic for her size. She isn't a round squidgy baby but at the same time doesn't look frail: her limbs are chubby with a lean/muscular torso. She has the Winston Churchill face of a well fed baby! 
I'm obviously not going to give solids till 6 months. She's 4+ months now so just thinking ahead, as I want to freeze ahead some foods.
But when I do, I don't want to cause a slow down in growth!! I know giving the wrong foods or the wrong amount can cause this. I read some rather routine-led books that my gut tells me were scaremongering but don't want to do anything "wrong".
Are there any tips or advice on how to do this? Or reliable, non faddy/evidence led books/sites. Thanks! 