He doesn’t need her permission and she doesn’t have to know though it is not advisable not to tell her

Can a husband get married second time without informing the first wife ? Or he has to take permission Give reference

Fiqh of Marriage | October 31, 2016 4:48 pm
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Can a husband has a physical relation with his wife while she is pregnant? Some says that they should not get close for the 1st 3 months of pregnancy. Please guide.
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If a guy wants to marry the lady of his choice but the parents wants him to marry another lady, what would be the law if he goes against the parent’s wishes? Is it a great sin if he follows his choice? Would appreciate your opinion on the matter.