Here is a link to a post I made a while back on the exact same issue - being told that guidelines changing back to 4 months

new-guidelines-introducing-solids-earlier-than-6-months.html

My conclusion was to wait until 6 months and from then on let DD try anything apart from honey (so not to delay introducing dairy etc). Have now been doing BLS for a couple of weeks and she is not showing much interest so despite me believing showing signs earlier - wasn't as ready as I thought.