My three week old has been very fussy since yesterday. He has been coughing and sneezing all day and…

My three week old has been very fussy since yesterday. He has been coughing and sneezing all day and cries out of nowhere. He sounds like a piggy when he is breathing. My toddler has been coughing too. I'm almost 100% sure my toddler got my newborn sick. Our heater in our apartment only goes to 70℉ it's fucking freezing outside and the landlord won't do anything about it. The windows have huge drafts coming in through all of them. We don't have a car so I can go buy a space heater. I feel like I'm doing everything I keep them bundled up and try to keep the apartment as warm as possible. I'm so tired from watching them all night! This stupid landlord better answer before I call the city on her.