To say the 'iQaamah in a child's ear

A child is born. You say the
adhaan in his right ear; you say
the 'iQaamah in his left ear. 
To do this is mustahabb. Those
who follow this opinion use
the following hadith as evidence

Narrated Abu Rafi':

I saw the Messenger of Allah (sallallaahu alayhi wa sallam) 
uttering the call to prayer (Adhan) 
in the ear of al-Hasan ibn Ali 
when Fatimah gave birth to him.

[Sunan Abi Dawud]

Ibn Hajar said in al-talkhiiS that
the chain of this hadith rests on
'aaSim bin 'ubaid Allaah who is
weak. 

Sheikh al-albaani graded the hadith
hasan.

Reference(s):

Kuwaiti Encyclopedia of fiQh