Most parents worry that their baby is sleeping less than required. Refer the baby sleep requirement by month chart to see if your baby is sleep as per her age. You will also notice that the sleep recommended for babies within each age group is a range. This accounts for individual variation. Some babies need more sleep and some are happier with less sleep. 

Babies waking up multiple during the night and requiring support to return back to sleep is  creates biggest challenges for the family. This is because the baby will go back to sleep but the sleep of parents are disturbed. Bedtime for babies and parents will mostly be different and the sleep cycle of babies are shorter - 45 mins to  1 hour while parents sleep cycle is around 1.5 hours. This means the sleep cycles could be out of sync and parents may be awaken from the restorative REM sleep. Parents will clock 8 hours of sleep but will not feel refreshed. Mothers especially are hit hard and adverse effects include fatigue, feeling low, anger, forgetfulness, reduced immunity and falling sick often and perhaps delayed recovery from post partum blues

Some babies have rigid preference like sleeping with a particular caregiver in an extremely particular manner, position and/or environment

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This includes sleeping only while being rocked in baby swing (hammock,  jhula, thooli) or sleeping in arms, sleeping on lap, sleeping  on shoulders while walking, sleeping on chest and sleeping while being patted or being nursed to sleep. Nursing to sleep or breastfeeding to sleep or sleep on side after feeding combined with night waking are especially hard on mothers. When the settling time or sleep onset latency that is the time to sleep is long or when you have to multiple times during night. It becomes diffcult

Rocking to sleep in hand jhula or thooli

Some babies have rigid preference like sleeping with mother while being rocked in hand, jhula, thooli or cradle. This behaviour is very tiresome when the baby exceeds 7 kg. This weight can be reached anywhere between 3 to 6 months time

Some babies have rigid preference like sleeping only when driven around in car, pram or stroller

Nursing to sleep, breastfeeding to sleep

Some babies have rigid preference like sleeping with mother while nursing or breastfeeding only. At certain time interval they tend to wake up and have to be feed to return back to sleep. This behaviour is very tiresome for mother and does not let other family members share responsibility of putting baby to bed 

Some babies sleep much later than their parents would like them to. There are cases where the baby goes sleep at almost 12 in the night and wakes up very late say 10 in the morning. This is unhealthy for the baby and difficult to manage for parents because the parents will have to wait for the baby to sleep and attend to household chores like tiding up the house or preparing for the next day. 

Among  twins  and  triplets one baby might be sleeping well and the other might not be. This is interesting because parents provide the same care and environment and yet genetically similar babies behave differently

Catnapping is when a baby sleeps for short periods of time, upto 20 minutes, during the day. Catnaps could indicate that the baby is ready to drop a nap or a bigger trouble if all the naps are cat naps.

The parents might take a long time to get the baby to sleep. This might more than 20 minutes of rocking, singing lullaby, patting and walking around. In other cases, the baby might start crying when taken to bed. Parents might want babies to settle into sleep sooner.

Parents might worry that baby not sleeping the entire night in a single consolidated stretch is a cause of concern or attending to the baby during the night is no longer possible as the primary case giver, mostly the mother is returning to work or due to health concerns, a full nights sleep is required for the primary care giver. This is a sub set of night waking trouble