can anyone shed some light on how normal/not normal this is please. baby is 6 months old and so far has had - bronchiolitis (feeding tube/oxygen/in hospital for a week), then caught covid, then chicken pox, and now has shingles. her older sister is in nursery so assuming she is just catching stuff through her but i’m worried at how easily she catches things? i’ve convinced myself she has a bad immune system and something more serious going in