Hold them too little, hold them too much, feed them on demand or stick to a schedule - either way, when it comes to newborns, there will always be someone to tell you you're doing it wrong.
While for most of us these "well meaning" strangers may bail us up in the supermarket or while enjoying some much needed coffee - for Katie Lee Biegel Instagram is where the mum shamers have struck.
The former USTop Chef host and now cookbook author and Food Network star shared a private message she received from a follower to tell her - of all things - she was holding her baby too much.
Lucky for Biegel, she wasn't afraid to hit back.
The new mum, who welcomed daughter Iris in September, said a fan - self described as "not a Karen" - told her she was impeding her baby's development.
"I'm sure you've been told this," the message said. "She needs time for her back/spine/stomach and muscles to develop ...not a 'Karen' just trying to help."
Not shy to share her feelings, Biegel shared the message on her Instagram stories, calling out the 'mum shaming'.
"Mom shame, much? Not to worry, my baby gets plenty of tummy time, activity time, etc," she wrote.
Fellow mums also had Biegel's back.
"I held my baby boy through naps for months!" one reassured her. "I was like you, a first time mom who had tried for a baby for years and had a successful career, etc. I was home with him and nursing and I held him almost constantly."
"He's now 19 months old and crawled, walked, and now sprints and climbs with ease."
"He also sleeps in his own bed through the night even though I never sleep trained, went to him at night every cry, and held him 'too much.' Do what feels right for you. Your baby will let you know when and what they need. You're doing a great job!"
While tummy time is important for helping babies to build head, neck and upper body strength, newborns only need short bursts to begin with.
According to Australian guidelines, babies can begin tummy time in the first few weeks after birth, starting from one to two minutes at a time, two or three times per day and building up to 10-15 minutes each time.