Sometimes, if people get in touch at short notice to view it is difficult to give much notice, it could be students visiting a college and taking a chance to view whilst in the area. ( you do not say if the place is being sold, or they will be new tenants). You should speak to your landlady and explain that with a new baby you have no set time with feeding, changing and the baby being asleep. Yes she has to give you 24hrs notice, and this she has done, but I think she has stretched it a bit, but she only has to find one lot of tenants to take the place, and as soon as someone has seen the place and liked it, she will stop showing others round, so it is in your interest to help and then you won't be bothered. Ask her if poss, if she could let you know early in the day for an afternoon booking so you have a few hours notice at least.