Drink lots of water, DO NOT scratch your belly ever even if it gets really itchy, watch your diet - make sure you are gaining eight gradually so your skin had time to adjust.
Other than that, just make sure to always put oil/butter on your skin.
It mainly depends on genetics but that's are the things that can minimize them.
Afraid it's mainly genetics! Drink plenty of water and moisturise your belly as often as you need too.