Sessions can start when a baby is less than a month old, and they work best in the first few months of life.
(Sessions; can start; T:when a baby is less than a month old) (a baby; is; less than a month old) (they; work best; T:in the first few months of life)
Sessions a baby they
can start is work best
T:when a baby is less than a month old
less than a month old
T:in the first few months of life