Chakra is a mysterious energy, and even though it provides similar, if not the same powers to the shinobi that train with it, it's inherent effects are not always the same. For many, the introduction of chakra gives one the basic abilities that most refer to as Jutsu.

However, some people have strange effects born from chakra in their body, which are generally known as Bloodline Limits. While it is possible for children to be born with a completely new effect, clans and families that have the same or similar bloodlines will breed true, until the majority of the group has the same chakra effects. This is why there are some that are born without the ability, or some with a more powerful version.

A young mind, unable to comprehend its own existence, but conscious enough to breathe and make it's discomfort known, will generally spend most of its unborn life just letting it's mother know of its hunger, and that is it's limit. But for the unborn Naruto Uzumaki, his chakra systems had just developed. This coupled with the massive force of chakra that was sealed just next to him led to his brain being developed exponentially faster.

In other words, his current thought processes were equal to a 3, bordering on 4 year old infant. With a brain that developed, emotions and higher thought levels were well developed, and he tried to learn. His physical capabilities were low, but he didn't have anywhere to move anyway. However, there was something that he was capable of looking at, and investigating.

The Kyuubi's seal.

Naruto was currently 5 months…

With an angry, and finally fully-conscious roar, The Kyuubi launched a massive claw at Naruto's infant body, in an attempt to prevent the sealing. Both of Naruto's parents jumped in the way, and he watched as they gave him their last words and finished the sealing. In a feeble movement, he dipped his fingers in the precious ink that laid the seal bare in his body, and adding a few small characters, nearly invisible among the rest of the seal.

Then his young body forced sleep upon him, and he knew no more.

The third Hokage, recently chosen to retake the mantle as the leader of the village, decided that he should be able to follow tradition with Naruto, and perform a small mental exam to make sure that he was healthy.

However, when Inoichi Yamanaka checked him out, he found a mind that was incredibly developed, the likes of which was never seen before. He warned the Hokage about the complex level of the child's psyche, and left. Grimly, Hiruzen called his student, Jiraiya, to his office, and conveyed the information. Jiraiya, considered to be a seal master, developed a special seal that would lock away the development, and lower his intelligence to a normal level for a baby of less than a week of age. It was applied, and the two of them decided to send him to an orphanage for his wellbeing, due to their inability for either of them to care for a child.