How those three are actually graded

Three reports circulate more than anything else on this subject, and none of them is one this platform will build on.

The report that the miscarried child will drag his mother by the umbilical cord into Paradise if she sought reward. This is very probably the single most forwarded text in Muslim miscarriage content, and the graders are genuinely divided on it. An-Nawawi, al-Iraqi and al-Busayri weakened it. Al-Mundhiri and al-Albani did not. When authorities of that standing split, the weaker reading is not the thing to hang a promise on.

The division is old rather than modern, and it is on our own shelves. Al-Ghazali quotes this material in the Ihya, among the things said to console a bereaved parent, and the takhrij carried inside the text, which is al-Iraqi's, ends on both wordings with وكلاهما ضعيف, our rendering, and both of them are weak. Al-Iraqi is one of the three named above. So that is his weakening, nine hundred years old, sitting on the same page as the report it weakens. It also tells you something else worth knowing: this has been circulating in Muslim consolation writing for nine centuries, which is why it reached you.

The report that the miscarried child will plead with his Lord and pull his parents out of the Fire. Graded weak.

The report about the house of praise, that when a child dies Allah tells the angels to build the servant a house in Paradise and to name it the house of praise. The grading shown on sunnah.com is weak. Some authorities have graded it good. This platform uses only sound and good reports, and where the grading is contested it stays out until a scholar rules, so it stays out.

That is the whole correction and it is smaller than it feels. It does not mean the opposite is true. Nobody is telling you that your child is not with Allah or that your patience is worth nothing. It means these particular chains are not strong enough to carry a promise, and a promise is a heavy thing to hang on a contested chain.

What follows is what is established, and it was in Bukhari and Muslim the whole time.