I have done the research actually! I don't agree with it. There are conflicting studies. Just because it's a study doesn't mean it is set in stone! There is a difference between stating my opinion as a mother in my situation with my child than providing advice.
https://www.pediatricsdigest.mobi/content/121/1/e44.full
https://pediatrics.aappublications.org/content/125/1/50.full
I agree with Emmae12uk as I have also looked at the scientific research and found that there are in fact conflicting studies. Above are links to scientific research published in the AAP's Pediatric Medical Journal whose conclusions are that delaying introduction of solids do NOT reduce the risk of asthma and allergies. In fact, some studies found that delaying introduction of certain solids can in fact increase the risk of having allergies to those foods.
In the WHO's position statement on breastfeeding they state that when compared to starting solids at 6 months in compared to 3 to 4 months, "
no reduced risks of other infections or of allergic diseases have been demonstrated. No adverse effects on growth have been documented with exclusive breastfeeding for six months. But a reduced level of iron has been observed in some developing country settings."
https://www.who.int/mediacentre/news/statements/2011/breastfeeding_20110115/en/
"
In developed countries there are no reported disadvantages to beginning weaning onto solid foods between 4 and 6 months compared with waiting until 6 months (EFSA 2009). A recent study of hospitalisation rates due to gastroenteritis or respiratory tract infection in the UK showed that these rates were higher in infants fed on infant formula compared to infants being breastfed but were unrelated to the age at which term infants, regardless of their milk feed, are weaned onto solid food (Quigley et al 2009)
"The European Society for Paediatric Gastroenterology, Hepatology and Nutrition and the North American Society for Pediatric Gastroenterology, Hepatology and Nutrition reviewed the literature on complementary feeding for healthy term infants in 2008 and recommend that:
Exclusive breastfeeding for around 6 months is a desirable goal,
Weaning onto solid foods should begin by 6 months but not before 4 months, Breastfeeding continues throughout weaning particularly the early stages, Introducing gluten* between 4 and 7 months while breastfeeding may reduce the risk of coeliac disease, type 1 diabetes and wheat allergy, High allergen foods such as egg and fish do not need to be delayed until after 6
months as there is no evidence that this will reduce the likelihood of allergies"
www.bda.uk.com/publications/.../PositionStatementWeaning.pdf for references