Some symptoms of a VSD include:
Bluish tint to the skin, lips, and fingernails
Poor feeding
Poor weight gain
Fast breathing
People may experience:
Whole body: Fatigue, inability to exercise, or sweating
Heart: Murmur or enlarged heart
Respiratory: Fast breathing or shortness of breath
Also common: Baby feeding difficulties, blue skin from poor circulation, failure to thrive, or swelling
https://www.cdc.gov/ncbddd/heartdefects/ventricularseptaldefect.html