My two had a 3.5 year gap. I used to say things to my son (the elder) like, “Look how she smiles when she sees you - she doesn’t smile like that for anyone else.” “She’s so pleased your home,” etc. This was when my daughter was a baby and couldn’t show any indifference! I think it helped my son started to feel protective towards her and to want to help with getting her bathtune things ready and suchlike.
Another Tired Kicking For The Sick And Disabled By Rishi
NHS U turn on trans terminology