My son is 9 months and he has had allergies. I suspected this because allergies run in my husband's family and he has asthma. And my son has struggled with ezcema. Found out that if I ate peanut butter it caused bad eczema for him. I cut out peanut butter and bye bye eczema! I had a blood test done recently to test for allergies. It was helpful to me... but I have heard from others on this forum that blood tests might not be accurate and not too reliable. I thought having the blood test would remove all worries... but I think the best thing is to test things out slowly.
I was eager for my son to eat solids and I would try to introduce two things at once (instead of doing one solid food at a time and wait 4 days inbetween). Soo much better to take it slowly. Otherwise if there is a reaction you'll drive yourself crazy trying to identify which thing it is.
My mother in law was worried about iron levels in my son. She is a registered nutritionist and works for WIC (Women Infants and Children). At 9 months the doctor tested for his iron levels (a simple finger prick). And it came back that he is anemic.
I like what the mom shared about not being worried by sticking too closely to dates and timelines. That is helpful advice.