Sayyiduna Habbah and Sawa', the two sons of Khalid (may Allah be pleased with them both), said: We went to the Prophet (peace and blessings be upon him) while he (peace and blessings be upon him) was working on something and it had become difficult for him (peace and blessings be upon him). He (peace and blessings be upon him) said: "Do not despair of provision as long as your heads move, for a human being is born to his mother red, with no covering on him, and then Allah provides for him."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6580