Hello mommies I'm worried gynecologist sent me to a specialist because she…

Hello mommies I'm worried gynecologist sent me to a specialist because she saw that my baby had short limbs. I only saw it on the referral letter., she never mentioned it to me. When I went to the specialist he told me my baby is behind by a week with her growth she's 1.2kg. What can I eat to boost her growth im worried. I'm 29 weeks