It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When a father looks at his child with delight, it is for the child equivalent to freeing a slave." It was said: "O Messenger of Allah, and if he looks three hundred and sixty times?" He (peace and blessings be upon him) said: "Allah is greater (in giving reward) than that."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11558