second time mom's

anyone else have people tell them "oh you'll forget about your first child once that baby comes!" Like I know I won't be able to give him my full undivided attention but now it's making me sad/worry that he will feel left out once she's here or i will not be able to tend to them "equally" per say. how long did it take you to get into a routine? did you feel guilty at all? I'm 25 weeks now I think these pregnancy hormones are getting to me lol. Thanks in advance ❤