First, Kim, congratulations on your daughter. These tough days WILL pass, though it may not seem like it right now, I know. Please see the pediatrician ASAP and if your current pediatrician has already seen the baby and dismissed this as "just teething," see a different one. You're the consumer here and if the baby's pain is constant, find someone who will listen to every detail you can offer. This groaning etc. could be teething but often that comes and goes. This may be something other than teething pain and you should see a pediatrician now, and be very detailed with the doctor about the baby's drinking, eating, how different body positions seem to make her "groan," how she seems constantly in pain, etc. Since she is nursing and also starting solids, this could be a bad problem with gas or acid reflux (which a lot of babies get and which can be quite painful) or even an early food allergy to something in the solids or something you've been eating (which could be affecting your milk). Or it could be something else that's not digestive, but a good doctor should ask you a lot of questions and keep probing. Yes, some infants just go through tough periods when they are simply cross all the time, but this sounds like physical discomfort rather than disposition, so please don't be too discouraged or label her personality as "grumpy." I know it may seem right now like she's just not being a fun, happy baby with whom you want to play and cuddle, but if getting her some help is your first stop, then you may soon get back a happier infant. Please report back here and good luck!