I have a cobalt hen and a dark green opaline dominant pied male, they have layed 5 eggs out of wich i have 3 lovely babies. None of the parent is having white colour but the eldest chick is pur white colour dont know how. Can some one give some light on it.

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So I take it your cobalt hen was a yellow face then?

I would guess that your hen only has 1 YF gene in that case, and that your male is split to blue. This chick looks like it might be a blue (mauve or cobalt) dominant pied.

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Your Dom pied is split for blue.If the chick has red eyes it is an albino and also a hen.It could be masking pied as well as Opaline and dark factors.One example of what it could is ..Albino Cobalt Opaline Dom Pied.The next breeding from the same pair may give you blues in normal blue cobalt and mauve...plus other combinations but this is only a quick break down without extensive detail....Good Combo mating...Three shades of green...three shades of blue plus pieds in all three and Albino.....Congrats....
Regards Jerry

The male is definitely split for blue. Well considering what the parents are, the probability of getting each offspring mutation should be:
3.125% olive d. pied male split for opaline
3.125% olive male split for opaline
6.25% dark green d. pied male split for opaline
6.25% dark green male split for opaline
3.125% lime green d. pied male split for opaline
3.125% lime green male split for opaline
3.125% mauve d. pied male split for opaline
3.125% mauve male split for opaline
6.25% cobalt d. pied male split for opaline
6.25% cobalt male split for opaline
3.125% sky blue d. pied male split for opaline
3.125% sky blue male split for opaline
3.125% olive d. pied opaline female
3.125% olive opaline female
6.25% dark green d. pied opaline female
6.25% dark green opaline female
3.125% lime green d. pied opaline female
3.125% lime green opaline female
3.125% mauve d. pied opaline female
3.125% mauve opaline female
6.25% cobalt d. pied opaline female
6.25% cobalt opaline female
3.125% sky blue d. pied opaline female
3.125% sky blue opaline female

So the baby doesn't seem to be any of the mutations that these parents are expected to have! This is very interesting. I guess they're both just split for albino or maybe the chick is just heavily pied so it looks all white (but that's unlikely in a single factor dominant pied).

Do you have pictures of the parents? It's possible that the father is a recessive pied, not a dominant pied and the mother was a clearwing split for r. pied which could result in a white dark eyed clear. But that might be stretching it. More picture of the baby from different angles would be helpful too. I saw someone suggested yellowface, but I didn't see any yellow (probably because of my computer screen), so I'd like to see some other pictures!
Can you tell the eye colour?

Hi after you asked me to see the eye coler i was ammaze the 1st 2 baby eye colour is dark black but the 3rd baby is having plum / red coloured. I can't say the feather colour its yet to come. But lookes to me albino / lutino. Is it possible if the parents have normal eye but the offspring can have plum coloured eye.?

attaching paresnts pic...

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attaching the pic of the plum coloured eyed baby. Looks Albino to me...

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Well I guess both parents were split for albino if the baby's eyes are red. It certainly looks like an albino. The parent's eye colour has nothing to do with the baby's eye colour if the mutation that the baby has was masked in the parents. Budgies split for albino won't have red eyes.

The first baby is a pied and looks to be recessive or possibly a combination pied if he/she got the dominant gene as well. The markings look light so it might also be opaline, and if so it is a female If it is a recessive pied both parents are split for recessive pied.

The third baby is a albino and from this pair genetically must be a female as Jerry mentioned. The father is split for blue and ino giving you the albino chick

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Originally Posted by MissListless Well I guess both parents were split for albino if the baby's eyes are red. It certainly looks like an albino. The parent's eye colour has nothing to do with the baby's eye colour if the mutation that the baby has was masked in the parents. Budgies split for albino won't have red eyes.

Ino is a sex linked mutation, so only males can be split for it

Oh jeez, right! What was I thinking!? Silly me. I normally never get the actual genetics part wrong, just identifying the mutations. Well at least I seem to be right about the recessive pied aspect.