Related Clues:

• What many kids go through
• Pip has Estella concealing periods
• New moon, full moon and others
• Periods of development
• Full and new, e.g
• Spells 'discombobulates' as that sounds
• Full and new, for two
• Passes through a solid object, like X-Men's Shadowcat
• Full and waxing crescent, e.g