I'm 1.5 cenameters dialited :) baby's heartbeat is in the 130s but what does it mean when my ob says my baby's is in the…

Baby is on the smaller side..

it’s your child’s size compared to other children their age

Is that bad?? Does it mean he will be weighing less??

Not necessarily and even if he is small it doesn't matter as long as he's healthy. My boy was only 6lb 15oz and very healthy at birth.