He wants to limit having children because he is poor

Allaah says (interpretation
of the meanings)

“And
no moving (living) creature is there on earth but its provision is due
from Allaah” [Hood
11:6]

 “And
so many a moving (living) creature carries not its own provision! Allaah
provides for it and for you. And He is the All‑Hearer, the All‑Knower”
[al-‘Ankaboot
29:60]

 “Verily,
Allaah is the All‑Provider, Owner of Power, the Most Strong” [al-Dhaariyaat
51:58]

 “so
seek your provision from Allaah (Alone), and worship Him (Alone), and
be grateful to Him”

[al-‘Ankaboot
29:17]

 Allaah condemned the people of the Jaahiliyyah
who killed their children for fear of poverty, and He forbade doing
what they did. Allaah says (interpretation of the meaning):

“And
kill not your children for fear of poverty. We shall provide for them
as well as for you. Surely, the killing of them is a great sin” [al-Israa’
17:31]

 Allaah has commanded His slaves to put
their trust in Him in all their affairs, and He is Sufficient for those
who put their trust in Him. Allaah says (interpretation of the meaning):

 “and
put your trust in Allaah if you are believers indeed” [al-Maa’idah 5:23]

 “And
whosoever puts his trust in Allaah, then He will suffice him” [al-Talaaq
65:3].

 So you have to put your trust in your
Lord and believe that He will provide for you and your children. Do
not let the fear of poverty prevent you from seeking to have children,
for Allaah has guaranteed provision for all. By not wanting children
for fear of poverty, you are imitating the people of the Jaahiliyyah.

 You should also note that taking out
loans with interest is ribaa (usury), for which Allaah issues the warning
of a painful torment. It is one of the seven sins which condemn a person
to Hell. The Prophet (peace and
blessings of Allaah be upon him) said: “Avoid the seven sins  which
condemn a person to Hell…[which include] consuming ribaa.” And he
(peace and blessings of Allaah be upon him) said: “Allaah has cursed
the one who consumes ribaa, the one who pays it…” Consumption of ribaa
is one of the greatest causes of poverty and loss of blessings, as Allaah
says (interpretation of the meaning):

 “Allaah
will destroy Ribaa and will give increase for Sadaqaat (deeds of charity,
alms)” [al-Baqarah 2:276]

 I think that you do
not know the ruling on interest-based loans. So seeks Allaah’s forgiveness
for what is in the past, and do not do it again. Wait for your Lord
to grant you a way out and seek provision from Him. Put your trust in
Him for Allaah loves those who put their trust in Him.