I have a degree in child development and before I had my own dc I thought I knew everything, as you do when you are young. Then when I had my own dc I heard mums at baby groups and on mumsnet talking about treasure baskets and schemas and the national curriculum in Sweden etc, all things I learnt in my degree. Then by the time I had my youngest everyone at baby group was talking about that wonder weeks book and surges of development which I'd never heard of.
I used to feel like I was an expert in this but now I feel less knowledgeable than the average parent. I don't know if it's a confidence thing or like when people say they have "done their own research" when they mean the daily mail rather than the Lancet. I just feel like my degree isn't worth anything much anymore because I don't know anything more about children than any other parent.