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According to 1, landlords can make changes to rental agreements without tenants’ consent, so long as they give the tenants the legally required notice. State laws vary on how much notice landlords must give before the changes take effect, but for month-to-month agreements, 30 days’ notice is the norm in most states. However, if the landlord wants to change the lease terms, they must give the tenant notice and the tenant must agree to the changes. The lease cannot be altered except through another written agreement signed by both parties unless the original lease specifically gives a party the power to change something on their own. In your case, the landlord cannot request you to re-sign the lease because you will have a new born. If you have any concerns, you can consult with a lawyer to know more about the rules that apply in your location2
1) https://www.rocketlawyer.com/real-estate/landlords/residential-property/legal-guide/can-a-tenant-refuse-to-sign-a-lease 2) https://tenant-lawyers.com/tenant-law/tenant-troubles-can-i-refuse-to-sign-a-lease/