He is asking about ihraam for children

We have already stated that Hajj of children is acceptable
according to sharee’ah, but that a child’s Hajj does not count as the “Hajj
of Islam” (i.e., the Hajj that is required once in a lifetime. We have
already explained what the guardian must do with his child. See questions
no. 13636;
36862,
14621. 

In addition to that, the guardian must pay attention to the
time when he wants the child to enter ihraam. If it is a time when it is not
so difficult for the child to enter ihraam, because there is less crowding
and so on, then he may enter ihraam; if it is too difficult for the child to
enter ihraam because there is too much crowding during Hajj, or during
‘umrah in Ramadaan, or because his guardian is unable, and so on, then in
this case it is better for the child not to enter ihraam, because that may
distract him (the adult) from performing properly the rituals that he is
required to perform. 

See al-Sharh al-Mumti’, 7/24. 

But many guardians
underestimate these difficulties or think that they will be able to put up
with them, then they find that the situation is not as they had thought it
would be. The child himself may not be able to remain in ihraam, and it may
be difficult for the guardian to make him stay in ihraam. What is the ruling
in this case? 

The well-known view in our madhhab (Hanbali) is that he has
to complete it, because Hajj and ‘Umrah must be completed once started. The
other view, which is the madhhab of Abu Haneefah (may Allaah have mercy on
him) is that he does not have to complete it, because he is not accountable
and is not obliged to do the obligatory duties of Islam. 

This view is more likely to be correct, and it seems to be
the view of the author of al-Furoo’ (i.e., Ibn Muflih, the student of
Shaykh al-Islam Ibn Taymiyah). 

Based on this, the child
may exit ihraam, and he does not have to do anything (i.e., offer any
ransom). This is actually kinder to people, because a guardian may think
that ihraam is easy for a child, then it turns out to be otherwise, so he is
faced with a dilemma. This happens a lot with people nowadays, so if we
adopt this opinion, which is more likely to be correct because of the
correct reason given for it, this will resolve the dilemma. 

Al-Sharh al-Mumti’, 7/25; see also al-Fataawa, 22/148.