According to Mahler's theory, period of normal symbiotic phase is:
According to Mahler's theory:

The normal autistic phase is 0-1 year.
Normal symbiotic phase is 4 weeks to 4 years.
Separation individualization phase is 5 to 36 months.
0 - 1 year
4 weeks to 4 years
8 weeks to 8 years
5 to 36 months