Don’t be too hard on yourself. I remember when my sister was little - she ate very well as a baby, but when she became around 2 years/toddler things completely changed. She stopped drinking milk for one. She also only wanted to eat all the foods that were bad for her (like pasta, pizza, McDonald’s and chocolate). And my parents were really stressing out because they eat super healthy and don’t know why she wanted to eat occasional style food on a daily basis. They took her to see the dr and he literally said “don’t worry too much about what she’s eating right now, the main thing is that she’s eating”. Luckily, after a few months she grew out of that. I think your baby might just be going through a phase - sometimes they just pick random things they like and want to stick to them.