| Variables | Estimated coefficients | Estimated standard error | p-value |
| Intercept | −1.016 | 2.459 | 0.6795 |
| Age | −0.0637 | 0.0145 | 0.0000116 (<0.05) |
| Weight | −0.0475 | 0.00852 | 0.000000024 (<0.05) |
| Height | 0.0398 | 0.0154 | 0.0102 (<0.05) |
| Gender | 0.0548 | 0.155 | 0.7246 |
| Baby weight | −0.0000553 | 0.00008012 | 0.4894 |
| Baby length | −0.0105 | 0.0291 | 237181 |
| Head circumference | 0.00258 | 0.0076 | 0.7339 |
| Shoulder length | 0.0260 | 0.0349 | 0.4569 |