There could be a lot of confusion in the family. His daughter might have a hard time trusting Naruto when she finally meets him. Naruto would have to work hard to build a relationship with her from scratch. Socially, it could cause a stir in the village as well. People would wonder how Naruto could be so unaware of his own family, and it might damage his reputation as a family - oriented ninja.
For Naruto, he would miss out on all the important early years of his daughter's life, like her first steps and first words. His daughter might grow up with a sense of longing for a father figure. It could also lead to problems within the extended family. His friends and relatives would be shocked and disappointed in him. And in the long run, it could have an impact on the village's view of Naruto as a hero. If he can't take care of his own family, how can he protect the whole village?
The first consequence would be the emotional turmoil for his daughter. She would grow up feeling rejected or unloved by her father. Naruto himself would also feel a great deal of guilt once he found out. His relationship with his wife would likely be strained as well, since she would be angry that he didn't know about their child.
One possibility could be that Naruto was away on a long - term mission when his daughter was born. He might have missed all the signs of his wife's pregnancy and then returned to find a child he didn't know existed. Another reason could be some sort of memory - altering jutsu was used on him, perhaps by an enemy, which made him forget about his family and his daughter in particular.
Emotionally, Naruto would have to deal with a whole new set of family relationships. He grew up without his parents, and now having them back would be a huge adjustment. He might struggle to fit into a 'normal' family dynamic, and there could be some friction as they all get to know each other again.
On a personal level, Naruto would finally get the family he always wanted. But it might also bring some confusion and adjustment issues. His parents would be from a different time, and they'd need to adapt to the new world Naruto lives in. For example, they might be shocked by the new technology and the changes in ninja warfare.
He would probably become very distrustful. After all, if your own parents betray you, it's hard to trust anyone else. He might isolate himself from others in the village, thinking that if his parents could turn on him, anyone could.
One consequence could be a change in the family dynamic. His mom would be back, and Naruto would finally have the family he always dreamed of. This might also have an impact on his relationship with his dad, as they would all be together again.
Well, from a medical perspective, without early detection, there's a risk of complications during childbirth. If the mother didn't know she was pregnant, she may not have adjusted her lifestyle accordingly. For example, she might have continued to smoke or drink alcohol, which is very harmful to the unborn baby. Emotionally, it can create a complex relationship between the mother and the baby initially, as she has to quickly come to terms with the new reality of being a mother when she was completely unprepared.
One consequence could be a shift in alliances. Without Loki leaving Jotunheim, the relationship between Asgard and Jotunheim would be far more complex. The Asgardians might view Loki as a traitor, which could lead to Thor being caught in the middle. He loves his brother but also has loyalty to his home. Loki, on Jotunheim, could start to build a new identity for himself. He might use his knowledge of Asgard to strengthen Jotunheim, making it a more formidable force in the Nine Realms. This could set off a chain of events that would change the entire power structure of the realms.
The story would likely take a very different turn. Sasuke's motivation and character arc would change drastically.
He would likely feel a great sense of confusion and loss. His sense of self would be severely shaken without the knowledge of his name, which is such an important part of one's identity.
Naruto's power might also be affected. If he was betrayed, he could lose the will to fight or train. He might even start to doubt his own purpose. This could lead to a decline in his abilities, which in turn could put the village at risk if he was its main protector.