Older child regressing after sibling attention, or is this something else?

[TheMaryClaire]

My daughter (born Sept '21) was fully potty trained and independent, but lately, she’s started using 'baby talk' and demanding I feed her just like I do with my 2-year-old son. She even had a potty accident today for the first time in over a year.

Am I missing something? Is this just sibling jealousy, or should I be worried about a developmental setback?

I would separate the ‘incidents’ - baby talk etc yes she is just looking for attention probably, it doesn’t necessarily mean she is regressing as such. The potty accident is a GP issue to rule out infection.