2chāan chik dou 親威到 — one's period has arrived, cf. yih māa dou 姨媽到.
3chāan chik gān 親威巾 — a sanitary napkin.
4chāan sāang jái bāt yuh gahn sān chihn 親生仔不如近身錢 — [one's own son is not as close as one's own money] having one's own money is safer than relying on one's children.