At 8 months old babies can see fairly well ... but @
PancakeBrah is right its more about sounds and smell basic senses that have dominated far longer then vision ... when my daughter was born my hair was actually pretty long .. soon as she started pulling that shit I went back to the 2-1-skin fade and I always kept my facial hair different .. line beard.. freeway beard. . Soul patch .. fred durst chin. . Goatee ... its forever different and its never bothered her one bit
You'll be ok its probably his tough ass gums not letting the teeth break through