Hmm, that doesn’t sound like normal behavior, to me, but I’m not a specialist. I feel that you should definitely tell your pediatrician that – have them check her hearing as well, sometimes when babies have problems with their hearing they don’t explore their environment, they don’t look around – have them check her eyes as well and if you want you can have a developmental specialist come to your house and do a check for disorders – there is usually an organization around that does these check-ups for free – they just watch your child for a day and are really good at picking up issues.