Allah said:

﴿وَعلَى الْمَوْلُودِ لَهُ رِزْقُهُنَّ وَكِسْوَتُهُنَّ بِالْمَعْرُوفِ﴾

(...but the father of the child shall bear the cost of the mother's food and clothing on a reasonable basis.) meaning, the father of the baby is obliged to provide for the expenses of the mother and to buy her clothes, in reasonable amounts usually used by similar women in that area, without extravagance or stinginess. The father spends within his means in this case. Allah said in another Ayah:

﴿لِيُنفِقْ ذُو سَعَةٍ مِّن سَعَتِهِ وَمَن قُدِرَ عَلَيْهِ رِزْقُهُ فَلْيُنفِقْ مِمَّآ ءَاتَاهُ اللَّهُ لاَ يُكَلِّفُ اللَّهُ نَفْساً إِلاَّ مَآ ءَاتَاهَا سَيَجْعَلُ اللَّهُ بَعْدَ عُسْرٍ يُسْراً ﴾

(Let the rich man spend according to his means; and the man whose resources are restricted, let him spend according to what Allah has given him. Allah puts no burden on any person beyond what He has given him. Allah will grant after hardship, ease.) (65:7)

Ad-Dahhak commented, "If the husband divorces his wife, with whom he had a child, and she suckles that child, he is required to provide for the mother's expenses and clothes within reason.''