Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "Whenever a boy is born in a household, a strength comes among them that was not there before."
Imam Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, Hashim bin Salih, whom Ibn Abi Hatim mentioned without criticising him or declaring him trustworthy, and the remaining narrators of this report have been declared trustworthy.