Even parents who would normally be extremely reluctant to tell the child should consider telling if any of the following scenarios applies:

When anyone other than the parents know about the donation, such that the child might find it out from somebody else. When the recipient carries a significant genetic disease, since telling the child will reassure the child that they do not carry the disease. Where the child is found to have a genetically transmitted disorder and it is necessary to take legal action which then identifies the donor.Conversely, when the child is being raised in a religion or a culture that strongly disapproves of donor conception (e.g., a Catholic country where egg donation is illegal), that may counsel against telling the child, at least until the child is much older and clearly capable of understanding why they were not told earlier and of keeping that information to themself. A systematic review of factors contributing to parental decision-making in disclosing donor conception has shown that parents cite the childs best interest as the main factor they use to make the decision. Parents who disclose donor conception to the child emphasize the importance of an honest parent-child relationship, while parents who do not disclose express their desire to protect the child from social stigma or other trauma. Health care staff and support groups have been demonstrated to affect the decision to disclose the procedure.
It is generally recommended that parents who disclose should do so in age-appropriate ways, ideally starting well before the age of five with a discussion of the fact that their parents needed help to have a child because certain things are needed to make a child—namely, sperm and eggs—and because the parents did not have one of those things, a nice woman gave it to them. Families sharing same donor
Having contact and meeting among families sharing the same donor generally has positive effects. It gives the child an additional extended family and may help give the child a sense of identity by answering questions about the donor. It is more common among open identity-families headed by single men/women. Less than 1% of those seeking donor-siblings find it a negative experience, and in such cases it is mostly where the parents disagree with each other about how the relationship should proceed. Other family members
Parents of donors may regard the donated eggs as a family asset and may regard the donor conceived people as grandchildren. Donor marketing
For a donor to be accepted by an agency and repeatedly used she must be marketable and appealing to the recipients. Although egg donation is a significant, life-giving act, the companies participating in this industry still have to operate with an economical mind-set. Matches between egg recipients and egg donors are what make the profit for the company and achievable to continue these processes for others.