Why do toddlers become fussy about eating?

Hello doctor,

My daughter is 11 months old and was born a fortnight before the EDD-LSCS elective procedure. The pregnancy was difficult with oligohydramnios and suspicion of IUGR. At birth, newborn screening showed raised tyrosine. Follow-up investigation and detailed tests at four weeks showed transient tyrosinemia in newborns. My daughter was fed vitamin D and multivitamins at six weeks. She was breastfed for the first six months. After six months, she is being given a home-based diet with nonvegetarian food once a week. However, at nine months, she stopped eating solids for ten days. During that phase, her lower incisors were erupting. Once their teeth erupted, she started eating again. At 11 months, she can stand with support, without support for a few seconds, walk a few steps with support, clapping, self-feeding food, and pass stools in the toilet. She has developed only lower incisors. She refused solid food for one week, and there has not been any weight gain in the last month. She is happy, plays, and sleeps 13 to 14 hours daily. We tried to give her commercial infant food, chicken, eggs, and home-cooked food. She does not eat more than two to four spoons and insists on breastfeeding. What should I do? Should I consider deworming? Is deworming treatment given to less than 1-year-old babies? Should I worry about tyrosinemia? Please help.

Thank you.