I was able to find the Church record as you have noted (Feb 1923), she had her birth as 28th January 1923. I was surprised that Jozefa née Pietrusewicz. I have a copy of Irena marriage certificate, but it shows Jozefa nee STARZYINSKA , so I am a bit confused.
Irena's siblings are noted as Ania and Julek, but I am unsure. She wrote to her sister as Anna. I would be interested in 'Ania and Julek' birth records. Maybe the Sielewicz family moved shortly after my mother (Irena) was born.
2026-01-30 Stan Nagiello