Hadith.911 - Imam Jafar ibn Muhammad Al-Sadiq (as) said:
"When a child is born, the adhan (call to prayer) should be recited in their right ear, and the iqamah (call to commence prayer) in their left ear."
Mīzān al-Ḥikma #513The Prophet (SAWA) said, ‘O Ali! When a son or daughter is born to you, recite the adhan in his [or her] right ear and the iqÁma in the left...