Allah says;

وَلَا تَقْتُلُوا أَوْلَادَكُم مِّنْ إِمْلَاقٍ ۖ نَّحْنُ نَرْزُقُكُمْ وَإِيَّاهُمْ

wa laa taQutloo aWlaadakum min imlaaQ. Nanhnu naRzuqukum wa iyyaahum –

And kill not your children out of poverty, We provide you and them.

(An’am 6:151)

وَلَا تَقْتُلُوا أَوْلَادَكُمْ خَشْيَةَ إِمْلَاقٍ ۖ نَّحْنُ نَرْزُقُهُمْ وَإِيَّاكُمْ

And kill not your children for fear [of] poverty. We provide them and you.

(Israa’ 17:31)

It seems like it’s the same thing. But it’s not;

In surah al An’am: it is describing when Poverty already exists - Who are you worried about feeding in that moment the most? = Yourself. So Allah tells us that He will provide for YOU and them.

In surah al Isra’: - there is a Future-Fear of Poverty being depicted. People may be able to feed themselves, but they fear for the providing of their children.

So Allah mentions that He will Provide for THEM [the children], since that is the persons main worry. 

This is part of the Miracle of the Qur’an: the Placement of Words. Each word is placed in a Unique place in accordance to it’s circumstance.

Sometimes you wonder why words are in a certain order yet their order has such a subtle implication to give you even more certainty that it is Allah who spoke this truth.