If that's indeed the result, it'll be easy to handle, just wait for the child to be born and do a paternity test.
That is the most direct and convincing method, but given Shen Chi's personality, he would probably be reluctant to do it.
Shen Chi is very good to this child, he can tell, clearly, Shen Chi doesn't care whose child it is.
To do the paternity test would be like cutting his own heart.
From the current situation, Xu Chaomu has mentioned to Shen Chi that the child is his, but Shen Chi hasn't believed it, mainly due to a lack of evidence.
Moreover, as the saying goes, "Love is blind." If he put himself in Shen Chi's shoes, he probably wouldn't believe it either.
It seems he'll have to thoroughly check on Xu Chaomu's activities in Paris in April.