I seriously wouldn't worry about it. I was told this all 3 of my boys and all but Ashton who was born prem was 6lb or over when born.

With Ashton I had a scan on the Tuesday and was told he was currently 4lb 11oz imagine my horror when I got contractions later that same day and went into early labour. Ashton was born around 40 hours later and came out at 5lb 13oz !! So definitely don't read too much into it.

Love