ראשית עריסותיכם חלה תרימו תרימה (שלח טו:כ)

It says “ראשית” -the first thing one needs to do “עריסותיכם” = which also means a cradle. When a child still lays in his cradle, “תרימו” – you shall pick him up as “תרומה” – to separate for Hashem thru the mitzvahs that are alluded in the word “חלה” – which are:
ח         – ימי מילה – the eighth-day when a  Bris is performed.
ל – לימי פדיון הבן – the 30th day when a Pidyan Haben takes place.
ה  – שנים למקרא – when a boy turns 5 he starts to learn Chumash.