Margaret Mahler’s Theory of Development

• Normal Autistic Phase Birth to 4 weeks
  
• Normal Symbiotic Phase 4 weeks to 5 months
  

The Subphases of Separation-Individuation Proper

• First Subphase: Differentiation – 5 to 10 months
  
• Second Subphase: Practicing — 10 to 16 months
  
• Third Subphase: Rapprochement — 16 to 24 months
  
• Fourth Subphase: Object Constancy — 24 to 36 months