Oh mummy, I feel you because I went through something similar when I was pregnant with my second child and the doctor flagged a concern about measurements at one of my scans. I was so worried and kept searching online for answers, but honestly my gynae told me that fetal measurements are something only the medical team can properly assess and manage. Please go see your gynae or O&G specialist as soon as possible, because this is not something to try to fix on your own at home. When my doctor had concerns about my baby's growth, she adjusted my monitoring schedule and gave me proper guidance that I could never have found by just eating certain foods. Your baby's safety comes first, so please do not wait on this one. You are doing the right thing by asking, and I hope you get the support and reassurance you need very soon.