Baby less weight

During 33wks scan, I was told the baby is small at mid section & underweight at 1.6kg. At 8mth Dr visit Dr say baby has shown to grow a lil however still is small. And there is a possibility to induce labour & deliver sooner at 37wks. We will wait for another 2wks to see if baby grows. If baby grows there will be no need to induce & jus carry on wif pregnancy. The expected baby weight is 2.5kg at 37wks if not hav to induce. Is that the weight gain in GA timeline ? Suld I induce or jus continue wif pregnancy unless baby has shown sign of stop growing