Second child timeline

(Kai’s comment on the same day Woolby tells you and Ikaruga that you are expecting a second child.)
You can have two children in your marriage. There is a timeline for this. I am trying to test the effect of an interrupted date.
I had my first child with Ikaruga, then used the Orb to marry Kai. Going back to Ikaruga created a tricky situation. As I had two children with Kai, it now was Year 18, but the timeline pays no attention to that. It only counts days.
I wanted to see as well if I could go back to Kai to celebrate the Fire Festival with him and then return to Ikaruga to have the second child without delay or any issue.
On 16 Summer at 6.00 a.m. the first event occurred. In this test, I stayed with Ikaruga until the 19th.
I left Ikaruga on 19 Summer in the evening without ever asking him to the festival. I returned to the shrine in the Fate where Kai awaited me in time for dinner and ask him to the festival.
20 Summer: I went through the process of making the purple super deluxe firework for Kai and spending the Festival with him. Immediately after, on the same night, I went back to the afateweaver Shrine. I discovered I could not return to Ikaruga. I believe I did have the option to start a new Fate.
Incidentally, I tested colours:
Mysterious Fabric makes Purple
Mysterious Fur makes Orange
Large Fur makes Orange
Mysterious Pauldron makes Red
Curse Cluster makes Purple
21 Summer: When I went to the Fateweaver Shrine the next morning, I could return to Ikaruga. On 22 Summer, we experienced the event where I asked him to accompany me back to the Shrine and then Woolby told us we are expecting a baby. I did not save any of this as I neglected my chores and so on.

I played through to the 20th on one file, staying with Ikaruga. This is the fellow who called my firework ‘the work of an amateur’ when I made one for him. I need to see this if I can change that!

I am trying to make a white firework but it is impossible
Daisy and white grass both make red. Hibiscus, blade shard Tamahagane, hermit iron fragment, bamboo make red
Platinum, silver, ice crystal, Dragonic Stone, rock. Lustrous gem, water crystal make blue
Dandelion, Light Crystal, Diamond, Exquisite Claw, Stong Claw, Quality Claw, thunder Crystal makes yellow
Can, Strong Fang, Strong Fur makes orange
Soul cluster, Fletch, Exquisite Fabric makes purple
Wind crystal makes green
I tried Orange using Strong Fur and Deluxe. Amazingly he loved it.
I then tried Lustrous Gem for Blue. But hit Medium by accident. He disliked it and said it was the work of an untrained hand!
Tried water crystal deluxe but he said it was from an untrained hand as well.
He said the same for deluxe yellow. I hate him more by the minute so will stop experimenting with him.
It seems to me now each individual respomds only to one colour. Ikaruga likes Orange.
The size did not matter. Only the colour!
When I did not leave Ikaruga and did not use the Orb on the 19th, I experienced the event to annoumce the pregnancy on the 21st instead of the 22nd.