Avoid frequent and prolonged separations

Avoid frequent and prolonged separations from your baby - Babies have an intense need for the physical presence of a loving, responsive parent. Through daily care and loving interactions strong parent-child attachments are formed. Frequent or prolonged separations can interfere with the development of secure attachments.  Try to keep separations down to a minimum when your preverbal baby is young and be responsive to your baby's need for your physical presence. Long separations can cause your baby to go hrough the stages of grief, and can affect his attachment to  you. If separations are inevitable given your situation, then help your child to gradually work towards them. Avoid "caregiver roulette"; continuity of care with a consistent, loving, caregiver, is critical.

From Attachment Parenting International (http://www.attachmentparenting.org/idealseparate.shtml)