When can introduce egg yolk into baby's diet? How about egg white ?

Usually if both family side got not much history of food allergies, can trial run of yolk 1st than white. I have friend start as early as 5-6 months and baby is fine with it. I cook the whole egg without separating them. And my LO is ok. So basically it's trial and error, do standby zytrec, if have allergies can feed straight away.