Little bit is ok
Eggs in general contain quite a bit of really good nutrition
---white the white contains mostly protein
and the yoke has many of the vitamins (except c) and quite a bit of cholesterol.
If baby is older than 4-6 months and eating table food, you can certainly give some eggs, including the yoke. Like all else in life, too much of anything is not good. Healthy habits lead to better health. Good luck!