55 Pa. Code § 3270.51
When children are grouped in similar age levels, the following maximum child group sizes and ratios of staff persons apply:
| Similar Age Levels | Staff | Children | Maximum Group Size | Total Number of Staff Required for the Maximum Group Size |
| Infant | 1 | 4 | 8 | 2 |
| Young toddler | 1 | 5 | 10 | 2 |
| Older toddler | 1 | 6 | 12 | 2 |
| Preschool | 1 | 10 | 20 | 2 |
| Young school-age | 1 | 12 | 24 | 2 |
| Older school-age | 1 | 15 | 30 | 2 |
This section cited in 55 Pa. Code § 3270.52 (relating to mixed age level); 55 Pa. Code § 3270.53 (relating to children of an operator or a staff person); 55 Pa. Code § 3270.113 (relating to supervision of children); 55 Pa. Code § 3270.173 (relating to transportation ratios); and 55 Pa. Code § 3270.241 (relating to requirements specific to school-age programs).