Following the birth of Iemitsu, the daughter of Toshimitsu SAITO named Fuku, who was a vassal to Mitsuhide AKECHI (the wife of Masanari INABA, a vassal of the Kobayakawa clan; later given the name Kasuga no Tsubone) became the wet nurse for Iemitsu, while Masakatsu INABA and Nobutsuna MATSUDAIRA became his pages.
誕生に伴い、明智光秀家臣・斎藤利三の娘である福（小早川氏家臣稲葉正成室、のちの春日局）が乳母となり、稲葉正勝・松平信綱らの小姓が付けられる。