Is separation anxiety more intense with breastfed babies? My daughter is so clingy!

No I think it's just natural that babies experience separation anxiety! When they start to become aware of their surroundings and have a memory of things then they begin to know how it feels like when mummy is not around. She spent 10 months in your womb of course she felt more secure in that familiar environment. My siblings and I were brought up on formula milk and we were still super clingy to our mum when we were young. You can communicate with your baby more to cope with this. For example reassuring your baby that you'll be back if you're leaving the room. Cuddle more or nurse your baby before you put him down for bed. The general rule is his to be more assuring! http://www.breastfeeding-magazine.com/infant-separation-anxiety.html