Baby not weighing enough

Sarah

Hi mamas. So I’m 32 weeks and went for a grown scan, the midwife says baby is not weighing as much as she should for her gestational weigh . My first baby was also small , but born with 3.5kgs in the end and I was endured at 37 weeks

Any vitamins or anything I could do to help her gain gestational weigh that she needs ?

Placenta working fine and no other problems