Replace [years] + [months dropdown] with a single text field that
accepts:
3y / 3 years / 3 yr
29m / 29 months / 29 mo
2y5m / 2 years 5 months / 2 yr 5 mo
3.5 years / 36 (plain number = months)
15 days / 2 weeks / 3y 2m 10d
Enables fractional ages so newborns can be plotted accurately
(WHO/CDC growth curves are continuous — "0 months" means at birth,
not a 0-27 day bucket, so a 15-day-old should plot at ~0.5 months).
Live hint below the field shows how the input was interpreted
("= 2 yr 5 mo (29 mo total)").
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