**The evidence does not support the blanket claim that daycare makes children antisocial or emotionally unstable.** There are studies finding small behavioral differences, but the results are mixed, and care quality matters.

“Antisocial” also needs clarification: researchers usually measure **externalizing behaviors**, such as aggression, disobedience, and impulsivity. These are different from being shy, preferring solitude, or having an emotional disorder.

Three useful findings:

- **Some older research found small associations with behavior problems.** The US NICHD study followed children from infancy into adolescence. More hours in nonparental care were associated with slightly greater impulsivity and risk taking at age 15; higher-quality care was associated with fewer acting-out behaviors and better academic outcomes. This was observational research, so it cannot establish that daycare caused the differences. [Vandell and colleagues, 2010](https://pmc.ncbi.nlm.nih.gov/articles/PMC2938040/)
- **A larger, newer analysis found no association between daycare hours and behavior problems.** It combined seven studies involving 10,105 toddlers and preschoolers across five countries. By examining whether changes in each child’s daycare hours accompanied changes in behavior, it reduced some of the problems with comparing different families. The average association was essentially zero. However, this does not settle every question about starting care in infancy or particular care settings. [Rey-Guerra and colleagues, 2023](https://doi.org/10.1111/cdev.13871)
- **Daycare does not automatically undermine attachment.** A study of 1,153 infants found no overall effect of childcare amount, type, quality, or starting age on attachment security at 15 months. Some combinations of less responsive parenting and adverse childcare conditions were associated with less secure attachment, which makes the findings more nuanced than “daycare damages the parent–child bond.” [NICHD, 1997](https://doi.org/10.1111/j.1467-8624.1997.tb01967.x)

For your decision, I would give more weight to **the actual care your son receives** than to the daycare label. Look for warm, responsive caregivers, enough staff to give babies individual attention, consistent caregivers, and clear communication about feeding, sleep, and distress. [ChildCare.gov’s selection guide](https://www.childcare.gov/consumer-education/find-and-choose-quality-child-care/choosing-quality-child-care-tip-sheets)

A “meh” first week tells you little about long-term development. At 8 months, separation anxiety can make starting care difficult. Familiarization visits and a brief, predictable goodbye can help. Ask caregivers whether he settles after you leave, accepts comfort, and has comfortable periods of feeding, sleeping, and exploring. Persistent distress throughout the day deserves a conversation with the caregivers and, if needed, his pediatrician. [American Academy of Pediatrics guidance](https://www.healthychildren.org/English/family-life/work-and-child-care/Pages/making-baby-drop-off-at-child-care-easier.aspx)

**These studies do not provide a basis for saying your wife needs to leave her job to prevent antisocial behavior.** Your family’s preferences, finances, and the quality of the available care are better grounds for that choice.