'Twas a daaaark and stoorrrmy night... Not really, it was actually a fairly bland day. Overcast, not too warm, nor too cold, but with the ever looming threat of rain in Amegakure. In a small wooden cottage, just north of where they'd till the land, a breeze rolled through the second floor window where Ozu's mother, Hisha, laid in bed after hours of agonizing labor (Ozu was difficult even in the womb, evidently). Wrapped in her arms, and looking up at her forgiving light blue eyes, Ozu felt safe. As much emotion as a newborn could feel, anyway. His father was absent from the miracle of birth, however, as he was out serving Konohagakure in a joint espionage mission that Ozu remembers hearing years later was "top secret". However, the rest of his family was there, though most were to young and uninterested to care about the new addition; his siblings a this point was 2, 5, and 6, 12 and 16, obviously the latter two were by their mother's side, asking multitudes of questions; whether she needed anything, was she feeling okay, what it was like, etc. She dismissed them from the room when she felt enough was enough. The rest of the night Ozu's father did not return, and Hisha had a feeling of deja vu, as this was certainly not the first time this had happened. In fact, there'd only been a single child he was there to witness the birth of, the eldest, Tozhu.
Spending the rest of the night crying endlessly, Ozu kept his mother up, allowing her to think, something most fear but embrace anyway. Early the next morning, after receiving word of his child's birth, his father Orozhu took leave of his mission in Fire Country and returned to Amegakure. As he held his "bundle of joy" (which really wreaked of feces and cried non-stop, hardly joyful), he couldn't help but tear up, as he did every time he had a child; this was now his sixth, and quite frankly, Orozhu had no intentions on stopping anytime soon.
Ozu recalled this tale being rather dreary and dull, but it was his birthday. He was constantly told as a child "be thankful you or your mother didn't pass", regardless of how dark that is to tell a child, Ozu understood that that was a common occurrence.

With his father being the namesake of the clan Yoruma, and his mother merely being married into it, the children had a choice whether to be a Shinobi or not. And from an early age, seemingly right after he began to walk, it was clear that Ozu wanted to walk in his father's footsteps and become a Shinobi, the first of the family since the eldest child was born. He'd begin throwing small kitchen knives around the house, not necessarily at people, just around, because aim isn't a concept most year old infants can understand, and he'd begin to trot around, jump (and successfully land, a feat most infants fail miserably at), as well as trying to kick and punch things, which is something infants do indeed do, but his were actually painful to some degree. Seeing as how the father was a higher rank than his brother, and thus away from the home more often than not, it was up to Tozhu to train his brother.
Orozhu was a kind-hearted soul when Ozu was younger, very friendly and personable, and rather outgoing, something totally uncharacteristic of the clan, hence perhaps why he developed many relationships with other shinobi and had many close friends. Tozhu, however, was a total bastard. Mean, vicious, rotten to the core, as Ozu remembers when he was young enough to receive formal training, his eldest sibling put him through Hell when giving him training. Strenuous cardio workouts, endless days of work on the farm to begin his body conditioning.
When it came to the actual shinobi training, it was hours upon hours of dreary meditation, to keep his chakra flow steady and consistent, rather than choppy and inconsistent as if evidently was. Boredom was one of the things Ozu could stand the least, obviously being a small child, any sort of physical or mental stimulus is required. He excelled and looked forward to his projectile throwing exercises, with kunai, shuriken and the like, as his aim was as good as was a normal genin when he was a mere toddler.
Only simple weaponry training and the balancing of his chakra was mandatory at such a young age, claimed Tozhu, for too strenuous of activity could disrupt his chakra consumption and flow in his later years, making it become too unpredictable when he becomes more powerful. Ozu had no idea why, but he just went along with it.
Most of his early childhood was spent with his older brother, training, and oddly enough, bonding. He developed a great friendship and relationship with his brother, becoming the best of friends, knowing one another's ins and outs. Due to his brother, he also met a lot of his extended family that his father refused to introduce them to due to personal vendettas and issues, such as his uncles, aunts, and his only remaining grandparent, his father's father, who'd remain somewhat of an idol for Ozu throughout his younger years, though he never really had any idea why, but like so many other things for children, Ozu just went along with it.