Hiro-sama
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
I'm guessing that the 49th anniversary of his death has already come to an end.
I also had the experience of a child having a miscarriage, and I really suffered and worried at that time.
Along with being the father of that child, as a monk, if I didn't send that child well... my voice trembled when reciting sutras at the memorial service in front of Mizuko Jizoson, and I couldn't stop my tears unwittingly...
After that, it probably took about 5 months for the couple to get back on their feet... due to the pregnancy of their next child (eldest son), to be honest, both the couple were happy, “Oh, maybe that child has come back,” and they had various anxieties, but they managed to overcome them and were born safely.
On the 24th of every month, the memorial service for that child continues along with the regular water child care, and even if they didn't come back, I'm sure they were able to get a good relationship with the Buddha and the Bodhisattva through the guidance of the Buddha and the Bodhisattva, and they are on good terms.
It is said that the next destination for those who have passed away will be decided between three weeks at the earliest and seven weeks (49 days) at the longest.
Of course, if you are a member of the Nichiren sect, it would be best to aim for enlightenment and nirvana under Shakyamuni through a pilgrimage to the Pure Land of Ryozen, and even if there is Mizuko, even if she has received an award or guidance, or even if there is a Mizuko who has lost her way in Sai no Kawara because she has no admonition or guidance, and no memorial service, I think Jizo Bosatsu will surely be guided at that time.
Also, I know that even if the cause of being born as a person still remains, or if you are encouraged to practice under the Buddha or Bodhisattva, you may be able to return to this world or be reborn if you work a little harder to practice in the human way.
If you do that, you may even be able to meet that child who has been reborn again.
Maybe that's the case with the next child, and maybe the other kids. If I can feel that kind of feeling, even if it's another child, if I think... it will lead to feelings of concern, kindness, and kindness for everyone, I think that would be precious and appreciated.
Kawaguchi Hidetoshi Gassho