My DD is 7.5 months and every single time she hears her brother cry, she starts wailing! Even if my son whimpers, she looks at me and starts pouting her bottom lip. It really makes things hard at night when I''m putting him to bed. He usually whines about putting on his PJs, which wakes her up in a full out cry. Happens every single night!
Is this just a phase? Did/does your LO do this too?