In the first year, nothing memorable happened. Except for the fact that an adult soul with a formed personality and enough knowledge to shock even Orochimaru (even if it was only in genetics and only the one who hadn't really started his real research in that area) was very ashamed every day because of the baby's body functionality. Imagine when you are trying to concentrate on your newly discovered energy manipulation or when you are playing with your parents (they are playing with you) and you **** in your diaper. It was a new and very uncomfortable experience for him.
Almost right after his birth he started to understand and learn everything he could, but in the first month his eyes and ears couldn't work properly. So the only thing he was doing was practicing his chakra control, although he didn't know it, but normally only a few children under the age of 4 can activate and control their chakra. It depends on many factors, but the main factor is the chakra reserves of the parents and the chakra density of the parents.
His mother was Half-Uzumaki and his father was the second son of the Yamanaka Clan leader, so he didn't have a problem with chakra quality, even though his father's chakra reserve was only of low Jonin. Since Yamanakas don't specialize in combat and ninjutsu, they only need chakra quality (density).
In the beginning, when he couldn't move his chakra in his body, he thought that he either had some defects or that every child had the same problem. First option was unlikely, he felt that AAIS wouldn't do such a thing.
Out of boredom he started to move his chakra slowly, even it was like a glue, after it will start moving everything must go smoothly. Chakra threads were like veins through which he could deliver his chakra to different parts of his body. His chakra system was like his cardiovascular system without a hearth, instead of the hearth there was something that sucked some energy from his soul and extracted physical energy from the cells in his body to mix them and produce his chakra.
After the first month he could already move his chakra, not fast, but instead of a few hours from the Central Chakra Generator (CCG) it took him only 3:34 minutes. Yes, it is not even enough to create an illusionary clone, but he was satisfied with his progress.
At the end of the year, his total chakra control was at the level where children can start manipulating leaves with chakra, he started walking when he was 5 months old, it wasn't some actual acquisition, because of the influence of chakra, shinobi children grow stronger and faster.
His chakra reserve grew faster than other children's chakra reserve, in coompare to the ones he met or just saw on the street while walking with their mother in the city, and yes, I don't know why everyone describes or mentions Konoha as a village, its perimeter is a bit smaller than the perimeter of the Paris ring. Only if we don't count the public and private training grounds. Private training grounds are only open to the members of the clan, they also have some protective field like Star Wars defense barriers, which also shows an illusion of some forest.
---
"Ichi-chan come on baby, we have to go out and meet your friends. Hurry up and before we go out, wash your hands, they are covered with chakra ink." - Akino, Ichimaru's mother, said.
"Allith mom, I'm almosht done with this!" - Ichimaru replied loudly from another room - "and another annoying problem, I still can't speak without mistakes. - Sigh.
After he started to speak so early, his parents were a little surprised, just a little, because Nara's babies started to say words a little early, even in comparison to their son. One day, while they were reading a baby book to Ichi, he started to read by himself and asked them to teach him how to read and write properly. After some consideration, Akino and Takeshi decided to teach him.
His father didn't have time to teach him much, but he tried, no one can blame him, it was still wartime, so every ninja is needed, luckily Yamanakas don't really work on the front lines, they focus more on interrogation and examination, although only a few Yamanakas could do examination. Even his mother was busy sometimes. She had to work and create Fuinjutsu, such as barrier, sensor, and explosive Fuins.
After some time of learning calligraphy, he came to his mother and said that he would help her. Her mother just tried to laugh him off, but when she saw a determined look in his eyes, she thought about it and decided to give him some paper and ink, it wasn't like he could do anything bad, just the price for the chakra ink was high.
After some time passed and she noticed that her child wasn't playing around, he drew very detailed Fuin, but since he didn't know what to do next, he just stared at his writing. After his mother noticed, she was proud and a little curious if he could actually do something simple if she explained what to do. So she does, and after explaining the basics, for example that he doesn't just have to draw, he has to fill his chakra with intention in some places, or he has to transform the chakra structure into an elemental chakra structure.
Unfortunately for Ichimaru, he couldn't do the elemental transformation, because to do the elemental transformation, at best, you have to have some elemental affinity in your blood like Uchiha and your CCG has to be fully formed, which takes almost 3-4 years, or you have to wait even longer if you are less clan.
He couldn't really train his body at that age, only stretching, which didn't take much time. And right now, the maximum he could do was to stick Fuin. It was a low-level training method for children in Fuin. His mother showed him how to do the same, and he repeated what his mother explained after the 4th try. After that day he started to help his mother with drawing and her mother could fill his Fuin with the chakra.
When he was 1 year old, he met two boys from the Nara Clan, a 2-year-old girl from the Akimichi Clan, a 1.5-year-old cousin, the little brother of his cousin Inouichi, the heir of the Yamanaka Clan and finally a 1-year-old boy from the Sarutobi Clan, who is actually the son of Sarutobi Hiruzen and the future father of Konohamaru. In his previous world, he once read that Danzo took him to his roots after his wife was tortured and killed on the mission before him and to get back at Hiruzen for something Danzo took his depressed son into his organization.
But back to the future,( :) ) it's been a week since he started practicing some simple exercises of chakra control and draining his chakra reserve, because he noticed that when CCG generates chakra, when Ninja has less than 10% of the maximum value, the chakra regeneration speed and the chakra pool grow slightly.
Since my third birthday, we have been visiting other children. I think we will form teams in the future, and I think it will be the Ino-Shika-Cho formation and me, Arata Sarutobi and Shiradai Nara. But I can't be 100% sure. Anyway, I know it's a bit boring and hard to play with 1 year old children when you have to act like a 1 year old, but I need to get to know them closely so that I can influence them and in the future, I will gain powerful support and small benefits from the son of the Hokage' - even though Ichimaru, while his mother was pulling him up and going to the Sarutobi's main compound, today they were meeting his future teammates at Arata's house.