3 month milestones

In the third month, your baby is becoming more and more aware of his new reality and the world around him as he reaches the 3 month milestones

His communication skills improve day by day, as he begins to explore everything he can find. Looks, smiles and babbles are his way of talking to you. Although the newborn still lacks some body coordination, he’s already able to point at objects and even hold some of them. One of the best 3 month milestones is that the baby’s vision can finally perceive colours, which is another big step in his development.

Check out the following information not only to learn the most common 3 month milestones, but also to find out all the tricks to go through this magical time, using all the tools in your mummy toolbelt!


3 month milestones: Slow and steady! 

As a caring mum, you are probably tempted to check on your baby's growth every chance you get. Don't feel too nervous if the newborn doesn't fit precisely into the height and weight standards, because every human being develops at a different pace. That being said, and as a reference, you should now expect your baby to measure around 60 cm and weigh between 5.5 and 6.3 kg. It is also good to know that the diameter of their skull tends to grow 1-2 cm every month after birth. At 3 months, most babies experience a growth spurt, a sudden and noticeable growth that happens in a short amount of time. 


3 month milestones: Baby is in control

When it comes to your baby’s growth month by month, you'll be astonished by how his motor skills get better. The 3 month milestones come in the form of significant changes in his movements, like:

  • Paying more attention to things, especially faces
  • Following moving objects or people with his eyes
  • Visual capabilities are like an adult’s
  • Holding his head steadier for longer
  • Improving hand-eye coordination
  • Better control over his hands, arms and legs
  • Putting hands, either busy or empty, into the mouth becomes a habit.
  • Grabbing and shaking toys
  • Crying usually is reduced to an hour or less a day


3 month milestones: Stick with the bottle

Breastfeeding and formula milk must be still your only options to feed your sweetheart by the 3rd month. Mealtimes are likely to become more spread throughout the day as he begins to eat more, but don't expect to be able to follow a schedule yet.

If you've ever heard that you can start feeding him with complementary food at 3 months, don't get on board with this! The American Academy of Pediatrics advises against this until the 4th month. 


3 month milestones: Catch up on your sleep

The 3 month milestones will bring some joy into your life. One of them is completely related to the baby's sleep cycle, which will be changing a lot. The baby is going to be sleeping longer, up to six or seven hours at a time, and this will allow you to (finally!) catch up on your sleep as well. The first two months as a mum were probably quite rough that way, but luckily, it should be almost over! If your little one wakes you up in the middle of the night, don't check on him right away. He may just cry or fuss for a second and then fall back to sleep (the baby needs to learn that on his own). If he doesn't stop after a few minutes, then it may be time for you to jump from bed and look after him.


3 month milestones: Your baby’s vaccines

If you've been following the recommended vaccination schedule for your little one, you probably began with the first shots last month. Obviously, it is very important for your growing baby's immune development and general health to receive all of the recommended vaccinations. In month 3, you will need to continue this process with the following shots:

  • The 5-in-1 vaccine, dose two, which is the vital second step to protecting your child from diphtheria, tetanus, whooping cough, polio, and Haemophilus influenze type b, or Hib.
  • The Meningitis C vaccine, dose 1, which will need to be followed up later at 1 year, and then again as a teenager. This vaccine protects against one type of meningitis that leads to infection and potentially deadly swelling around the spinal cord and brain, as well as septicaemia, which occurs when the body is overwhelmed by infection. You'll want to keep your little one safe from these two!
  • The Rotavirus vaccine, dose 2, which prevents children from catching a nasty little stomach bug that causes diarrhoea, tummy ache, fever, and vomiting.

Don't be scared by all these diseases and infections that can harm your baby -as long as you follow the recommended vaccination schedule and keep regular appointments with your GP, your baby will most likely be safe and sound!


3 month milestones: What not to do

Now that you know a little bit more of what to expect about the milestones for three month old babies, you should also keep in mind some things that you should avoid doing for the time being. As mentioned before, be sure not to skip any doctor's visits, and don't introduce new foods into your baby's diet just yet. Here are just a few more recommendations of what not to do: 

  • Don't worry if your child has reached only some of the 3 month milestones; remember that everyone develops differently.
  • Don't give him any toys that can break easily or have small parts that can be a choking hazard. He will want to shake, smash, and taste everything he touches!
  • Don't let him sleep face down just yet, as this can still be dangerous for a three month old. Instead, continue putting him to bed on her back like you have been.
  • Don't limit him too much. Let him move around, touch things, and explore. All that practice and movement will be a great help when he begins crawling in the future! 


Remember that these 3 month milestones are rough guidelines to give you an idea of what to expect during these early months of development. All of these milestones may occur earlier or later than expected. The important thing is that you and your baby continue getting to know each other, learning from each other, and that you use everything at hand to keep him happy and healthy.


Need help? Ask other mummies in CaptainMums' forum!


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