I have read on an article that in the world to come , every day women will bear children and I want to know if this is true and if so where it says that in the Mishnah.
The source is in a gemara in Masechta Shabbos 30b:
בְּדִבְרֵי תוֹרָה מַאי הִיא? — כִּי הָא דְּיָתֵיב רַבָּן גַּמְלִיאֵל וְקָא דָרֵישׁ: עֲתִידָה אִשָּׁה שֶׁתֵּלֵד בְּכָל יוֹם, שֶׁנֶּאֱמַר ״הָרָה וְיוֹלֶדֶת יַחְדָּיו״. לִיגְלֵג עָלָיו אוֹתוֹ תַּלְמִיד, אָמַר: ״אֵין כׇּל חָדָשׁ תַּחַת הַשָּׁמֶשׁ״! אֲמַר לֵיהּ: בֹּא וְאַרְאֶךָּ דּוּגְמָתָן בָּעוֹלָם הַזֶּה. נְפַק אַחְוִי לֵיהּ תַּרְנְגוֹלֶת.
In matters of Torah, what is the case with regard to which the verse said that one should respond to a fool’s folly? As in the case where Rabban Gamliel was sitting and he interpreted a verse homiletically: In the future, in the World-to-Come, a woman will give birth every day, as it says: “The woman with child and her that gives birth together” (Jeremiah 31:7), explaining that birth will occur on the same day as conception. A certain student scoffed at him and said: That cannot be, as it has already been stated: “There is nothing new under the sun” (Ecclesiastes 1:9). Rabban Gamliel said to him: Come and I will show you an example of this in this world. He took him outside and showed him a chicken that lays eggs every day. (Sefaria translation and notation)
The Talmud (Shabbos 30a) writes that there will be a time when a woman will conceive and give birth on the same day, without having the difficulties of pregnancy and childbirth.
This will be after the sin of Adam is rectified. This is because the pains of pregnancy and childbirth are to atone for the sin of Eve, however after that is rectified things will return the original way that God wanted it to be.
Have no fear. At that point there will be no concern about having food, or housing for all of them. Nor will there be any concern of how the parents will put them through college.