Is what you did—disposing of donations not designated for a specific cause, and disbursing them at varying time intervals according to your schedule of visits—religiously permissible? And is there no harm in delaying the disbursement of $400 from Ramadan until yesterday, even though the last visit to the children was in Ramadan?

Funds designated for general charitable purposes may be spent on any avenue of charity, while observing what is most beneficial. It is not permissible to delay their expenditure beyond their intended use as long as the need exists, unless there is an overriding benefit in doing so. However, if the donor stipulates that their money be spent in Ramadan, and the agent knows that they cannot fulfill this condition, then it is not permissible for the agent to accept the money with this condition. If the agent accepts it and then violates the condition, they have acted wrongly, unless there is a compelling excuse. It is advisable to seek clarification from the donor when accepting funds to prevent confusion and misgivings.