When Sarada asks her father if his feelings are connected with Sakura's, Sasuke replies yes. It is interesting to note that at the beginning of the arc, Sakura explained to Sarada that her feelings are connected to her husband's. When Sarada asks Sasuke the same thing, he answers yes, as if he is already familiar with the phrase because he feels the same way about Sakura that Sakura feels about him, and this shows that their feelings are indeed connected.
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When Sarada asks how Sasuke knows that for certain, Sasuke replies, "Because you exist." Some fans have said that Sasuke means that Sarada is the reason that Sasuke grew to care about Sakura, but that is reversing the meaning of what he is actually saying.
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Sasuke isn't telling Sarada that he loves Sakura because she is the mother of his child and that it's only because they had a child together that he eventually came to harbor feelings of affection for Sakura after their daughter was born.
What Sasuke is telling his daughter is that because he and Sakura loved each other, Sarada was born from that love and his daughter lives as proof of the romantic bond Sasuke and Sakura share. His daughter is the symbol of the love between him and the woman he loves, a physical, living manifestation of their romantic connection.
Some criticize Sakura's expression for not looking enthused enough, commenting that she doesn't look particularly happy. But it's a serious moment, and Sakura is gently smiling. Plus notice how she's the only person on the manga page who is bruised and battered from the battle? Sakura is tired, which may be why she isn't beaming brightly. Additionally, she's reading the mood of the setting and letting the specialness of the moment seep in. Given the poignant weightiness of the moment, I feel like a big smile is uncalled for. Sakura is gently smiling at her husband's declaration of his love and feelings for her in front of their daughter. I personally don't think that her expression looks upset or unhappy. It looks more sweet and pleased, if a bit tired.
