Constipation in baby? Need help please

Rachael

So I have a dr appointment booked, they only had 23rd March available :( my little girl is 11 months, formula fed and on solids (baby food jars and finger foods). She seems to be constipated. She will strain and strain and either nothing happens or it will be wide and hard to pass so I have to help her out. She seems ok in herself no fever no temperature having her bottles normally etc. She hasn’t pooped for about 3/4 days now just wondering if anyone else has had this and if so what did you do to help your LO? We have got purée prune baby food. We offer her water she has a warm bath every night and I’ve started massaging her tummy