Recommendations are always changing due to health care professionals knowledge base widening
Incorrect.
It last changed in 2003 to around 6 months.
It is this flippant comment which has so many people weaning from 12 weeks as their parents and grandparents did it.
The advice is simple and has been in place for over 16 years from World Health Organisation (WHO) and recommended by reputable organisations such as the NHS, BDA, NCT and Allergy UK (links below)
Early weaning (eg before 6 months) is advice mainly (loosely) said by baby food organisations (then backed up by parents), who will skim around the 6 month mark, as their food will be marked “4-6 months” to confuse parents and ultimately encourage parents to buy their jars and pouches. They’d ultimately sell more food if the advice was “from 4 months” rather than “around 6 months”. It’s a clever trick.
Who’s advice is best to follow - reputable organisations, or baby food manufacturers?
Here are two good summaries of the history of weaning:
Bounty - summary of weaning through the ages
Irish Times - good one talking about the history and sums up the main advice post 2003
There is some research that suggests the rise in allergies is due to delays in introducing allergens into children's diets so late.
The research you refer to is based on those “high” risk of allergies, eg a mother, father, sibling with an allergy. It specifically states to introduce egg or peanut earlier, not wean earlier too. See further information on allergy concerns from:
BSACI
Allergy UK
OP, do your research like you would have researched your car seat and buggy.
These links are a good start:
British Diet Association
NHS
National Childbirth Trust
Based on all of the above, wait as close to 6 months as you can and please, speak to a health care professional about your baby.
Around 6 months means just that, some babies may be ready earlier than 6 months, and some later, yours may be ready earlier, but there are a number of signs you need to look for, not just relying on her being on a high centile.
You know your baby and your reasons for wanting to start weaning earlier than the advice given in the links I’ve posted. Using the baby’s weight / centile is not a reason to wean earlier, albeit it could be alongside other signs that your baby is showing but talking to a HC professional is your first point of call.