Ruling on giving zakaah to a nursing infant who is not yet eating solid food

It is not stipulated that the one who is entitled to
receive zakaah should be an adult of sound mind or should be eating solid
food; rather the condition for being eligible to receive zakaah is what is
mentioned in the Qur’aan of being poor or needy. Allah says
(interpretation of the meaning):

“As-Sadaqaat (here it
means Zakaah) are only for the Fuqaraa’ (poor), and Al‑Masaakeen (the poor)
…”

[al-Tawbah 9:60].

Based on that, if this nursing infant has no wealth or has no
one to spend on him and cover his needs, it is permissible for him to be
given zakaah, which may then be spent on hiring someone to breastfeed him or
on what he needs of clothing or medical treatment and so on. 

Ibn Qudaamah (may Allah have mercy on him) said: It is
permissible to give zakaah to both old and young, whether he eats solid food
or not. Ahmad said: It is permissible to give zakaah in order to pay the fee
for breastfeeding a foundling, who comes under the heading of the poor. And
it was narrated from him that it is not permissible to give it to anyone but
one who is eating solid food, but the former view is more correct, because
he [the infant] is poor, so it is permissible to give it to him just as in
the case of one who is eating solid food, and because he needs zakaah to pay
for someone to breastfeed him, clothe him and meet all his other needs. So
he comes under the general meaning of the texts.

End quote from al-Mughni, 2/268 

But if there is someone who can take care of his needs, then
it is not permissible to give zakaah to him, because he is no longer in need
because of their support. It says in the commentary on Qalyoobi wa
‘Umayrah (4/28): The one who is sponsored by a relative or a spouse is
not poor, according to the more correct opinion, because he is not in need;
this is like the one who can earn every day enough to suffice him. End
quote. 

The majority of scholars (may Allah have mercy on him) said
it is permissible to give kafaarah (charity given in expiation) to a nursing
infant, as is explained in the answer to question no.
66886. 

And Allah knows best.