hair color, nail polish, candles

so what’re the rules on hair coloring, painting your nails, candles, etc around a newborn??

my husband and i have always colored each other’s hair & even though we just colored them a couple weeks before baby’s arrival he is almost two weeks old now & our hairs desperately need a coloring 😂 wondering if it’s safe to color our hair still inside if hes in a different room or should we be near an open window if he is in the room w us?

& same with painting your nails & burning a candle, could the smell of nail polish or a burning candle effect my LO???