The first two months           

Two to four months

 

 

Four to six months   

Six to eight months

 

 

 

 

 

 

 

 

 

 

 

 

Eight months to a year

One to 1½ years

 

 

 

 

 

 

 

 

 

 

 

1½ to 2 years

2 to 2½ years

 

 

 

 

 

 

 

 

 

 

 

2½ to 3 years

3-4 years

 

 

 

 

 

 

 

 

 

 

 

 

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