Sibling spacing based on older child's temperament
I'm a 38-year-old mom of a 1-year-old. She's a wonderful, curious, and fun baby but no one would ever describe her as easy going... We'd like to have a second baby but my family has cautioned us that based on our daughter's temperament, it might be particularly hard on her to have a younger sibling when she's under 3 (even though in general 2.5 years is common sibling spacing). They recommended waiting until she's three to have another baby.
I think they're right that our daughter benefits from a lot of parental love and attention right now and if I were ten years younger, I'd definitely wait. However, waiting would mean I'd be 39 or 40, and I'm worried about my ability to conceive again. So, I'd be curious about how others in similar situations have navigated the tradeoff between sub-optimal birth spacing and potentially waning fertility.
Also, if anyone could weigh in on how their more high strung 2.5 year old reacted to a younger sibling, that would be very helpful too. Thank you!