There is a chance that an ancient spirit of the chasm saves Naruto. This spirit sees Naruto's special chakra and decides to bond with him. As Naruto grows, he can communicate with the spirit and gain special powers from it, like the ability to control the very rocks of the chasm or sense any danger approaching from within the chasm.
It could be a group of wandering merchants. They are passing by the chasm when they hear Naruto's cries. They take him in and raise him as one of their own. Naruto would then grow up learning about trade and business, but his ninja instincts would still be there, and he might end up using his business skills to improve the ninja world's economy in the future.
A hermit who lives in seclusion near the chasm might save him. This hermit could be an ex - ninja who has given up on the world but still has a kind heart. He would then take Naruto in and start training him in his own unorthodox ways, which could include using the natural elements of the chasm area in combat.
One possibility is that Naruto's fall is interrupted by some sort of time - space distortion. He is then transported to a different dimension where he is raised by an advanced civilization. They see his potential and train him in ways that are far different from the ninja world. This could make him return to the Naruto universe later with extremely powerful and strange abilities.
Sasuke could be the one to save Naruto. Despite their past differences, Sasuke still has a connection to Naruto. He might sense Naruto's danger and rush to his aid, using his Sharingan to find a way to safely get Naruto back up from the bottom of the cliff.
Some of the more traditional ninja elders might oppose Naruto's decision. They could think that Naruto, as a busy ninja, doesn't have the time to take proper care of a baby. They might be worried that it could affect his performance in important missions.
Sasuke could save him. Despite their differences, Sasuke might still have that underlying bond with Naruto and show up just in time to catch him or pull him to safety.
His friends like Sakura, who is a medic - ninja, would surely be the first ones to try to help. She could use her medical knowledge and skills to diagnose Naruto's illness.
The relationship would likely be very loving. Naruto, being a big - hearted person, would be an affectionate father. He'd probably play with the baby and tell stories of his adventures. Temari would be a protective mother, making sure the baby is well - cared for. The baby would be the center of their world, and they'd do anything to keep it safe.
Sakura would be a likely candidate. As a skilled medical ninja, she has the knowledge and ability to diagnose the poison and attempt to create an antidote.
Sakura could be the one to save Naruto. She is a skilled medical ninja. She could use her medical jutsu to keep Naruto alive even while he is crushed. Then, with the help of others like Kakashi, they could figure out a way to remove the rock and fully heal Naruto.
It could be a rogue ninja from a hidden village. There are always some ninjas who go against their village's rules and become outlaws. They might target Naruto because of his reputation or the power of the Nine - Tails within him.
Maybe a rogue ninja group that wants to sell Naruto to the highest bidder. They see him as a valuable asset due to his strength and status in Konoha.