My baby is 6 weeks old and I have co-slept with my baby every night. I have stopped telling people I do this because I get a lot of critism. Likewise my baby feeds a lot and frequently, but then likes to sleep for 4-5hr stretches.
I recently sought assistance for feeding problems and talked to the midwife/lactation consultant about co-sleeping, settling the baby (until 4 days ago she wouldnt go down in the bassinet for longer than 15 minutes. Even when dead asleep she woke up) and always holding the baby. The LC told me not to worry. She said that studies have shown that being responsive to the baby and not letting her cry gives the baby the confidence to try new things. Babies left to cry themselves to sleep at too young an age give up that anyone will respond to their needs. She said the studies indicate these children are more likely to develop anxiety issues. likewise, nature intended that babies sleep with their mothers.
I saw a really interesting video with Dr John McKenna about co-sleeping that has put my mind at ease about this issue. (I realise you were not asking about co-sleeping, but it has been my bugbear) Its no one elses business so long as I safe sleep with my baby and DH is happy to continue with the current arrangement for a few more weeks.
I tell my family now that she is so young she is not 'learning crying gets a response' - she is far too young for that. She crys because she needs something. I have made it clear I will always respond to my baby. They are backing off now.